JP3244129B2 - Magnetic recording media - Google Patents
Magnetic recording mediaInfo
- Publication number
- JP3244129B2 JP3244129B2 JP35963191A JP35963191A JP3244129B2 JP 3244129 B2 JP3244129 B2 JP 3244129B2 JP 35963191 A JP35963191 A JP 35963191A JP 35963191 A JP35963191 A JP 35963191A JP 3244129 B2 JP3244129 B2 JP 3244129B2
- Authority
- JP
- Japan
- Prior art keywords
- group
- magnetic
- parts
- vinyl chloride
- radiation
- 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.)
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- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、オ−ディオテ−プ、ビ
デオテ−プ、コンピュ−タ−テ−プ、磁気ディスク、フ
ロッピ−ディスク、磁気カ−ドなどに関して用いられる
磁気記録媒体の性能向上に関し、さらに詳しくは、放射
線により硬化するバインダを用いた磁気記録媒体に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in performance of a magnetic recording medium used for an audio tape, a video tape, a computer tape, a magnetic disk, a floppy disk, a magnetic card, and the like. More specifically, the present invention relates to a magnetic recording medium using a binder which is cured by radiation.
【０００２】[0002]
【従来の技術】近年、磁気記録媒体においては、放射線
硬化性樹脂を磁性粉およびその他の必須成分とともに混
合分散して磁性塗料を調整し、得られる磁性塗料を支持
体上に塗布、乾燥させた後、放射線硬化し磁性層を形成
することが行なわれている。そして、これら放射線硬化
性樹脂として、塩化ビニル系共重合体に不飽和二重結合
を導入した樹脂が使用されている。特開昭６１−５９６
２１号公報においては分子量３００〜１０，０００の水
酸基を有する塩化ビニル系共重合体に２−イソシアナ−
トエチルメタアクリレ−ト（ＭＯＩ）を反応させた放射
線硬化性塩化ビニル系共重合体を得ている。しかしなが
らこの範囲の樹脂では十分な機械物性を有する塗膜は得
られない。2. Description of the Related Art In recent years, in a magnetic recording medium, a radiation curable resin is mixed and dispersed with a magnetic powder and other essential components to prepare a magnetic paint, and the obtained magnetic paint is coated on a support and dried. Thereafter, radiation curing is performed to form a magnetic layer. As these radiation-curable resins, resins obtained by introducing unsaturated double bonds into a vinyl chloride copolymer are used. JP-A-61-596
In JP-A-21, 2-isocyanate is added to a vinyl chloride copolymer having a molecular weight of 300 to 10,000 and having a hydroxyl group.
A radiation-curable vinyl chloride copolymer obtained by reacting triethyl methacrylate (MOI) is obtained. However, a resin having sufficient mechanical properties cannot be obtained with a resin in this range.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、上記の種々
の欠点を改良しようとするもので、磁性粉の分散性、配
向性に優れ、かつ耐久性に優れた高記録密度化に適した
磁気記録媒体を提供するものである。SUMMARY OF THE INVENTION The present invention is intended to improve the above-mentioned various drawbacks, and is suitable for high recording density which is excellent in dispersibility and orientation of magnetic powder and excellent in durability. A magnetic recording medium is provided.
【０００４】本発明は、水酸基、および−ＳＯ3Ｍ基
（ＭはＨ，Ｌｉ，Ｎａ，Ｋ，Ｂａ，Ｃｓの原子を表す）
を有し、−ＳＯ3Ｍ基の濃度が１０〜２００当量／１０6
ｇであり、かつ分子量が１０，０００〜１００，０００
の塩化ビニル系共重合体（Ａ）とエチレン性不飽和二重
結合を１個以上およびイソシアネート基１個を分子中に
有しかつウレタン結合を分子中に持たないモノマー
（Ｂ）とをＮＣＯ基／ＯＨ基（当量比）が０．５〜０．
９／１．０の範囲で反応させて得られる、ウレタン結合
濃度が２００〜４００当量／１０6ｇの範囲の放射線硬
化型樹脂と磁性分とを含む磁性層が支持体上に設けら
れ、該磁性層が放射線照射により硬化されている磁気記
録媒体である。[0004] The present invention represents a hydroxyl group, and -SO 3 M group (M represents H, Li, Na, K, Ba, atoms of Cs)
Has, -SO 3 concentration of M groups 10 to 200 equivalents / 10 6
g and a molecular weight of 10,000 to 100,000
A vinyl chloride copolymer (A) and a monomer (B) having at least one ethylenically unsaturated double bond and one isocyanate group in the molecule and having no urethane bond in the molecule. / OH group (equivalent ratio) is 0.5 to 0.1.
A magnetic layer containing a radiation-curable resin having a urethane bond concentration in the range of 200 to 400 equivalents / 10 6 g and a magnetic component, which is obtained by reacting in the range of 9 / 1.0, is provided on the support. This is a magnetic recording medium in which the magnetic layer is cured by irradiation with radiation.
【０００５】本発明において、水酸基および−ＳＯ3Ｍ
基（ＭはＨ，Ｌｉ，Ｎａ，Ｋ，Ｂａ，Ｃｓの原子を表
す）を有しかつ分子量１０，０００〜１００，０００の
塩化ビニル系共重合体（Ａ）としては、塩化ビニル−酢
酸ビニル−ビニルアルコール共重合体、塩化ビニル−ビ
ニルアルコール共重合体、塩化ビニル−ヒドロキシアル
キル（メタ）アクリレート共重合体、塩化ビニル−酢酸
ビニル−ビニルアルコール−グリシジル（メタ）アクリ
レート共重合体などがあり、また、極性基として−ＳＯ
3Ｍ基（ＭはＨ，Ｌｉ，Ｎａ，Ｋ，Ｂａ，Ｃｓの原子を
表す）含有することが必要である。In the present invention, a hydroxyl group and -SO 3 M
The vinyl chloride copolymer (A) having a group (M represents an atom of H, Li, Na, K, Ba, or Cs) and having a molecular weight of 10,000 to 100,000 includes vinyl chloride-vinyl acetate. -Vinyl alcohol copolymer, vinyl chloride-vinyl alcohol copolymer, vinyl chloride-hydroxyalkyl (meth) acrylate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol-glycidyl (meth) acrylate copolymer, and the like. Further, as a polar group, -SO
(The M represents H, Li, Na, K, Ba, an atom of Cs) 3 M group is necessary to be contained.
【０００６】本発明において、エチレン性不飽和二重結
合を１個以上およびイソシアネ−ト基１個を１分子中に
有し、かつウレタン結合を分子中に持たないモノマ−
（Ｂ）としては、２−イソシアネ−トエチル（メタ）ア
クリレ−ト、メタクリロイルイソシアネ−トなどがあ
る。この分子の様にイソシアネ−ト基とアクリル基の距
離は短くなければならない。In the present invention, a monomer having at least one ethylenically unsaturated double bond and one isocyanate group in one molecule and having no urethane bond in the molecule.
Examples of (B) include 2-isocyanateethyl (meth) acrylate and methacryloyl isocyanate. As in this molecule, the distance between the isocyanate group and the acrylic group must be short.
【０００７】水酸基、および−ＳＯ3Ｍ基（ＭはＨ，Ｌ
ｉ，Ｎａ，Ｋ，Ｂａ，Ｃｓの原子を表す）を有しかつ分
子量１０，０００〜１００，０００の塩化ビニル系共重
合体（Ａ）とモノマー（Ｂ）との反応によってウレタン
結合によりエチレン性二重結合を導入するが、塩化ビニ
ル系共重合体（Ａ）とモノマー（Ｂ）の重量比によって
放射線硬化性を自由に設計できる。しかしながら、ウレ
タン結合濃度を上げすぎると分散性の低下が生じる。そ
こで分散性と硬度のバランスをとると、ウレタン結合濃
度が２００〜４００当量／１０6ｇの範囲でなけばなら
ない。また、塩化ビニル系共重合体の未反応水酸基を多
くすると、水酸基間の水素結合による溶液粘度の増加が
起きるため、ＮＣＯ基／ＯＨ基（当量）が０．５／１．
０以上である必要がある。しかし、反応性の点からはＮ
ＣＯ基／ＯＨ基が０．９／１．０以下である必要があ
る。この溶液粘度と反応性を考慮すると、ＮＣＯ基／Ｏ
Ｈ基が０．５〜０．９の範囲で塩化ビニル系共重合体
（Ａ）とモノマー（Ｂ）を反応させなければならない。A hydroxyl group and a —SO 3 M group (M is H, L
i, Na, K, Ba, Cs) and a vinyl chloride copolymer (A) having a molecular weight of 10,000 to 100,000 and a monomer (B). Although a double bond is introduced, radiation curability can be freely designed by the weight ratio of the vinyl chloride copolymer (A) and the monomer (B). However, if the urethane bond concentration is too high, the dispersibility decreases. Therefore, when balancing the dispersibility and hardness, the urethane bond concentration must be in the range of 200 to 400 equivalent / 10 6 g. Further, when the number of unreacted hydroxyl groups of the vinyl chloride copolymer is increased, the solution viscosity increases due to the hydrogen bond between the hydroxyl groups, so that the NCO group / OH group (equivalent) is 0.5 / 1.
Must be 0 or more. However, in terms of reactivity, N
The CO group / OH group needs to be 0.9 / 1.0 or less. Considering the solution viscosity and reactivity, the NCO group / O
The vinyl chloride copolymer (A) and the monomer (B) must be reacted in the range of 0.5 to 0.9 for the H group.
【０００８】本発明における、塩化ビニル系共重合体
（Ａ）とモノマ−（Ｂ）との反応は、必要に応じて反応
に関与しない公知の有機溶剤に塩化ビニル系共重合体
（Ａ）を溶解させ、公知のウレタン化触媒を用い、公知
のラジカル重合禁止剤、たとえばハイドロキノンを用
い、反応温度６０℃以下で行なわれる。In the reaction of the vinyl chloride copolymer (A) with the monomer (B) in the present invention, the vinyl chloride copolymer (A) may be added to a known organic solvent not involved in the reaction, if necessary. The reaction is carried out at a reaction temperature of 60 ° C. or lower using a known urethanization catalyst and a known radical polymerization inhibitor, for example, hydroquinone.
【０００９】本発明において磁性粉としては、γ−Ｆｅ
2 Ｏ3 、Ｆｅ3 Ｏ4 、γ−Ｆｅ2 Ｏ3 とＦｅ3 Ｏ4 の混
晶、コバルトをド−プしたγ−Ｆｅ2 Ｏ3 、コバルトを
ド−プしたＦｅ3 Ｏ4 、二酸化クロム、バリウムフェラ
イト、または鉄、コバルト等の金属磁性体、あるいは種
々の合金磁性体等をあげることができる。[0009] In the present invention, γ-Fe
2 O 3, Fe 3 O 4 , γ-Fe 2 O 3 and Fe 3 O 4 mixed crystal, cobalt de - flop the γ-Fe 2 O 3, cobalt de - flop the Fe 3 O 4, chromium dioxide , Barium ferrite, metal magnetic materials such as iron and cobalt, or various alloy magnetic materials.
【００１０】上記放射線硬化性樹脂および磁性粉のほか
に、ポリエステルアクリレ−ト、ポリウレタンアクリレ
−ト、エポキシアクリレ−トなどの放射線硬化性樹脂、
スチレンなどの希釈モノマ−、潤滑剤、研磨剤、帯電防
止剤などを添加し、塗布などの方法により支持体上に磁
性層として設け、必要に応じて乾燥後、放射線照射によ
り硬化させて磁気記録媒体を得る。[0010] In addition to the radiation-curable resin and the magnetic powder, radiation-curable resins such as polyester acrylate, polyurethane acrylate and epoxy acrylate,
A diluted monomer such as styrene, a lubricant, an abrasive, an antistatic agent, and the like are added, and a magnetic layer is formed on the support by a method such as coating, dried if necessary, and then cured by radiation irradiation for magnetic recording. Get the medium.
【００１１】本発明の磁気記録媒体に用いられる支持体
としては、ポリエチレンテレフタレ−ト、ポリエチレン
ナフタレ−ト、ポリカ−ボネ−ト、ポリプロピレン、ポ
リ塩化ビニル、ポリイミド、ポリアミドイミド、アルミ
ニウム合金などの任意の物をあげることができる。ま
た、塗布乾燥後の磁性層の厚さは通常２〜２０μｍであ
る。The support used in the magnetic recording medium of the present invention includes polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polypropylene, polyvinyl chloride, polyimide, polyamide imide, aluminum alloy and the like. Anything can be given. The thickness of the magnetic layer after coating and drying is usually 2 to 20 μm.
【００１２】本発明において使用される放射線として
は、電子線加速器などを線源とした電子線、Ｃｏ60を線
源としたγ線、Ｘ線発生器を線源としたＸ線、紫外線な
どである。The radiation used in the present invention includes an electron beam using an electron beam accelerator or the like, a γ-ray using Co 60 as a source, an X-ray using an X-ray generator as a source, and ultraviolet rays. is there.
【００１３】[0013]
【実施例】以下、実施例により本発明を説明する。実施
例中部とは、重量部を表す。 合成例 １ 下記の塩化ビニル系共重合体（Ｉ）１００部をメチルエ
チルケトン２００部とトルエン５０部に溶解させ、つい
でフェノチアジン、ハイドロキノンを各々下記アクリル
化合物に対して２００ppm 混合した。その後、２−イソ
シアナ−トエチルメタアクリレ−ト（ＭＯＩ）５部、ウ
レタン化触媒のジ−ｎ−ブチルチンラウレ−ト（ＤＢＴ
Ｌ）を上記イソシアネ−ト化合物に対して１０００ppm
混合し、反応温度６０℃で８時間撹拌を行なった。ＩＲ
スペクトルによりイソシアネート基の吸収がないことを
確認した。 塩化ビニル系共重合体（Ｉ） 共重合組成：塩化ビニル５５ｗｔ％、酢酸ビニル３９ｗ
ｔ％、スルホニルスチレンのナトリウム塩１ｗｔ％、ヒ
ドロキシエチルアクリレ−ト５ｗｔ％ 分子量：２５０００The present invention will be described below with reference to examples. The middle part in the examples means parts by weight. Synthesis Example 1 100 parts of the following vinyl chloride copolymer (I) was dissolved in 200 parts of methyl ethyl ketone and 50 parts of toluene, and then phenothiazine and hydroquinone were mixed at 200 ppm with respect to the following acrylic compound. Thereafter, 5 parts of 2-isocyanatoethyl methacrylate (MOI) and di-n-butyltin laurate (DBT) as a urethanization catalyst were used.
L) with 1000 ppm based on the isocyanate compound
The mixture was mixed and stirred at a reaction temperature of 60 ° C. for 8 hours. IR
The spectrum confirmed that there was no absorption of isocyanate groups. Vinyl chloride copolymer (I) Copolymer composition: 55% by weight of vinyl chloride, 39w of vinyl acetate
t%, sodium salt of sulfonylstyrene 1 wt%, hydroxyethyl acrylate 5 wt% Molecular weight: 25,000
【００１４】合成例 ２ 水酸基を含有し、水酸基以外の極性基をほとんど含有し
ない塩化ビニル酢酸ビニル系共重合体「ＶＲＯＨ」（ユ
ニオンカ−バイド社製）２００部をメチルエチルケトン
４００部、トルエン１８０部に溶解させ、ついでフェノ
チアジン、ハイドロキノンを下記各々アクリル化合物に
対して２００ppm 混合した。その後ＭＯＩを２０部加
え、ＤＢＴＬを上記イソシアネート化合物に対して、１
０００ppm混合し、反応温度６０℃で８時間攪拌を行な
った。ＩＲスペクトルによりイソシアネート基の吸収が
ないことを確認した。Synthesis Example 2 200 parts of vinyl chloride / vinyl acetate copolymer "VROH" (manufactured by Union Carbide Co.) containing a hydroxyl group and containing almost no polar group other than a hydroxyl group is dissolved in 400 parts of methyl ethyl ketone and 180 parts of toluene. Then, 200 ppm of phenothiazine and hydroquinone were mixed with each of the following acrylic compounds. Thereafter, 20 parts of MOI were added and DBTL was added to the above isocyanate compound by 1 part.
000 ppm, and the mixture was stirred at a reaction temperature of 60 ° C. for 8 hours. It was confirmed by IR spectrum that there was no absorption of isocyanate groups.
【００１５】合成例 ３ ８０℃に加熱したトリレンジイソシアネ−ト １７４部
にハイドロキノン０．１３部を加えた後、２−ヒドロキ
シエチルメタアクリレ−ト１３０部を徐々に滴下するこ
とにより加え、８０℃で２時間反応させてアダクト体を
得た。塩化ビニル系共重合体「ＶＲＯＨ」（ユニオンカ
−バイド社製）２００部をメチルエチルケトン４００
部、トルエン１８０部に６０℃で溶解させ、これに得ら
れたアダクト体５０部を加え、ウレタン化反応触媒のＤ
ＢＴＬを０．１部加えた。６０℃で８時間撹拌し、ＩＲ
スペクトルによりイソシアネ−ト基の吸収のないことを
確認した。Synthesis Example 3 After adding 0.13 part of hydroquinone to 174 parts of tolylene diisocyanate heated to 80 ° C., 130 parts of 2-hydroxyethyl methacrylate was gradually added dropwise. The reaction was performed at 80 ° C. for 2 hours to obtain an adduct. 200 parts of vinyl chloride copolymer "VROH" (manufactured by Union Carbide Co., Ltd.)
And 180 parts of toluene at 60 ° C., and 50 parts of the resulting adduct was added thereto.
0.1 parts BTL was added. Stir at 60 ° C for 8 hours, IR
From the spectrum, it was confirmed that there was no absorption of an isocyanate group.
【００１６】実施例 １ 成分 コバルトをド−プした針状 γ−Fe2O3(比表面積２１m2/g) １００部 カ−ボンブラック（帯電防止剤） ４部 アルミナ粉末（研磨剤） ８部 レシチン ３部 メチルエチルケトン ５０部 トルエン ５０部 成分 合成例１において得られた樹脂の溶剤溶液 ６０部 ウレタンアクリレ−ト「アロニックス Ｍ−１２００」（東亜合成化学工業株 製） ７部 ステアリン酸ブチル ２部 メチルエチルケトン ９０部 トルエン ９０部 上記成分をボ−ルミル中にて３時間混合分散させ、次
いで上記成分を加え、５時間混合分散させて磁性塗料
を得た。ＮＣＯ基／ＯＨ基（当量比）は０．７５であ
る。得られた磁性塗料を厚さ１５μｍのポリエステルフ
ィルム製支持体に塗布することによって磁性層を設け、
磁場配向させ、電子線を５Mrad照射することにより硬化
させた。得られた磁気フィルムについて、磁気記録媒体
の性能評価を行なうために表面光沢（グロス６０度）、
角形比（Ｒｓ）、走行耐久性の評価を行なった。なお、
上記の磁性塗料は２４時間放置後も磁性塗料の沈澱やバ
インダ−の分離等はほとんど認められず非常に安定なも
のであった。Example 1 Component Cobalt-doped acicular γ-Fe 2 O 3 (specific surface area 21 m 2 / g) 100 parts Carbon black (antistatic agent) 4 parts Alumina powder (polishing agent) 8 parts Lecithin 3 parts Methyl ethyl ketone 50 parts Toluene 50 parts Ingredients Solvent solution of resin obtained in Synthesis Example 1 60 parts Urethane acrylate "Aronix M-1200" (manufactured by Toa Gosei Chemical Industry Co., Ltd.) 7 parts Butyl stearate 2 parts Methyl ethyl ketone 90 parts Toluene 90 parts The above components were mixed and dispersed in a ball mill for 3 hours, and then the above components were added and mixed and dispersed for 5 hours to obtain a magnetic paint. NCO group / OH group (equivalent ratio) is 0.75. A magnetic layer was provided by applying the obtained magnetic paint to a 15 μm-thick polyester film support,
The composition was oriented in a magnetic field, and cured by irradiating an electron beam at 5 Mrad. For the obtained magnetic film, the surface gloss (gloss 60 degrees) was used to evaluate the performance of the magnetic recording medium.
The squareness ratio (Rs) and running durability were evaluated. In addition,
The magnetic paint was very stable with little precipitation of the magnetic paint or separation of the binder even after standing for 24 hours.
【００１７】比較例 １ 実施例１において、合成例１で得られた樹脂の溶剤溶液
の代わりに、合成例２で得られた樹脂の溶剤溶液を使用
し、同様の組成および分散条件で磁性塗料を調整し、同
様の評価を行った。なを磁性塗料の安定性は不良であっ
た。COMPARATIVE EXAMPLE 1 In Example 1, the solvent solution of the resin obtained in Synthesis Example 2 was used in place of the solvent solution of the resin obtained in Synthesis Example 1, and the magnetic paint was prepared under the same composition and dispersion conditions. Was adjusted, and the same evaluation was performed. The stability of the magnetic paint was poor.
【００１８】比較例 ２ 実施例１において、合成例１で得られた樹脂の溶剤溶液
のかわりに、合成例３で得られた樹脂の溶剤溶液を使用
し、同様の組成および分散条件で磁性塗料を調整し、同
様の評価を行った。なを磁性塗料の安定性は不良であっ
た。得られた磁気フィルムについて、実施例と比較例と
の評価結果を表１に示す。Comparative Example 2 In Example 1, the solvent solution of the resin obtained in Synthesis Example 3 was used in place of the solvent solution of the resin obtained in Synthesis Example 1, and the magnetic paint was prepared under the same composition and dispersion conditions. Was adjusted, and the same evaluation was performed. The stability of the magnetic paint was poor. Table 1 shows the evaluation results of the examples and the comparative examples for the obtained magnetic films.
【００１９】[0019]
【表１】 表１から明らかなように、本発明のバインダ−を使用す
ることにより、磁性粉の分散性、配向性に優れ、磁性記
録媒体としての耐久性を著しく向上させることができ
る。[Table 1] As is clear from Table 1, by using the binder of the present invention, the dispersibility and orientation of the magnetic powder are excellent, and the durability as a magnetic recording medium can be remarkably improved.
【００２０】[0020]
【発明の効果】本発明における水酸基及び水酸基以外の
極性基を有した特定の塩化ビニル系共重合体をイソシア
ネート基とエチレン性不飽和二重結合を有する化合物で
特定量のウレタン結合濃度になるように変性した放射線
硬化性樹脂は、従来の塩ビ系バインダーでは達成が困難
であった磁性塗料の安定性を著しく向上させるのみなら
ず、磁性粉の分散性、耐向性に優れ、かつ放射線硬化に
より強靱な樹脂塗膜を形成することができるため、耐久
性に優れ、かつ高記録密度化に適した磁気記録媒体を提
供することができる。According to the present invention, a specific vinyl chloride copolymer having a hydroxyl group and a polar group other than a hydroxyl group is prepared by using a compound having an isocyanate group and an ethylenically unsaturated double bond so as to have a specific urethane bond concentration. Radiation-curable resin modified not only significantly improves the stability of magnetic paint, which was difficult to achieve with conventional PVC binders, but also has excellent magnetic powder dispersibility, Since a tough resin coating film can be formed, a magnetic recording medium which is excellent in durability and suitable for high recording density can be provided.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−41618（ＪＰ，Ａ) 特開 昭64−72320（ＪＰ，Ａ) 特開 平４−67314（ＪＰ，Ａ) 特開 昭61−59621（ＪＰ，Ａ) 特開 昭62−149763（ＪＰ，Ａ) 特開 昭56−77930（ＪＰ，Ａ) 特開 昭57−44227（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G11B 5/702 C09D 175/04 C09D 127/06 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-41618 (JP, A) JP-A-64-27202 (JP, A) JP-A-4-67314 (JP, A) JP-A-61-67 59621 (JP, A) JP-A-62-149763 (JP, A) JP-A-56-77930 (JP, A) JP-A-57-44227 (JP, A) (58) Fields investigated (Int. 7 , DB name) G11B 5/702 C09D 175/04 C09D 127/06
Claims (1)
ｉ，Ｎａ，Ｋ，Ｂａ，Ｃｓの原子を表す）を有し、−Ｓ
Ｏ 3 Ｍ基の濃度が１０〜２００当量／１０6ｇであり、か
つ分子量が１０，０００〜１００，０００の塩化ビニル
共重合体（Ａ）とエチレン性不飽和二重結合を１個以上
およびイソシアネート基１個を分子中に有しかつウレタ
ン結合を持たないモノマー（Ｂ）とをＮＣＯ基／ＯＨ基
（当量比）が０．５〜０．９／１．０の範囲で反応させ
て得られる、ウレタン結合濃度が２００〜４００当量／
１０6ｇの範囲の放射線硬化型樹脂と磁性分とを含む磁
性層が支持体上に設けられ、該磁性層が放射線照射によ
り硬化されている磁気記録媒体。1. A hydroxyl group and a --SO 3 M group (M is H, L
i, Na, K, Ba, Cs).
A vinyl chloride copolymer (A) having an O 3 M group concentration of 10 to 200 equivalent / 10 6 g and a molecular weight of 10,000 to 100,000, one or more ethylenically unsaturated double bonds and It is obtained by reacting a monomer (B) having one isocyanate group in the molecule and having no urethane bond in an NCO group / OH group (equivalent ratio) range of 0.5 to 0.9 / 1.0. The urethane bond concentration is 200 to 400 equivalents /
A magnetic recording medium in which a magnetic layer containing a radiation curable resin in the range of 10 6 g and a magnetic component is provided on a support, and the magnetic layer is cured by irradiation with radiation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35963191A JP3244129B2 (en) | 1991-12-26 | 1991-12-26 | Magnetic recording media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35963191A JP3244129B2 (en) | 1991-12-26 | 1991-12-26 | Magnetic recording media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05182175A JPH05182175A (en) | 1993-07-23 |
| JP3244129B2 true JP3244129B2 (en) | 2002-01-07 |
Family
ID=18465488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35963191A Expired - Fee Related JP3244129B2 (en) | 1991-12-26 | 1991-12-26 | Magnetic recording media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3244129B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9076478B2 (en) | 2011-01-12 | 2015-07-07 | Fujifilm Corporation | Binder resin composition for magnetic recording medium, method of manufacturing the same, and magnetic recording medium |
-
1991
- 1991-12-26 JP JP35963191A patent/JP3244129B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05182175A (en) | 1993-07-23 |
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