JPH0467314A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH0467314A JPH0467314A JP17565790A JP17565790A JPH0467314A JP H0467314 A JPH0467314 A JP H0467314A JP 17565790 A JP17565790 A JP 17565790A JP 17565790 A JP17565790 A JP 17565790A JP H0467314 A JPH0467314 A JP H0467314A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- vinyl chloride
- recording medium
- group
- 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.)
- Granted
Links
- 229920001577 copolymer Polymers 0.000 claims abstract description 19
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 15
- 229920005989 resin Polymers 0.000 claims abstract description 15
- 239000011347 resin Substances 0.000 claims abstract description 15
- 239000006247 magnetic powder Substances 0.000 claims abstract description 11
- 230000005855 radiation Effects 0.000 claims abstract description 11
- 239000000178 monomer Substances 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 239000011230 binding agent Substances 0.000 abstract description 5
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 abstract description 2
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 238000009937 brining Methods 0.000 abstract 1
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 9
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 8
- 239000003973 paint Substances 0.000 description 8
- 229920002554 vinyl polymer Polymers 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000003786 synthesis reaction Methods 0.000 description 7
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- -1 glycidyl acrylate compound Chemical class 0.000 description 5
- 239000002904 solvent Substances 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000010894 electron beam technology Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920000915 polyvinyl chloride Polymers 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000007809 chemical reaction catalyst Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 2
- WJFKNYWRSNBZNX-UHFFFAOYSA-N 10H-phenothiazine Chemical compound C1=CC=C2NC3=CC=CC=C3SC2=C1 WJFKNYWRSNBZNX-UHFFFAOYSA-N 0.000 description 1
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 description 1
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000008065 acid anhydrides Chemical class 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 1
- 229940090961 chromium dioxide Drugs 0.000 description 1
- IAQWMWUKBQPOIY-UHFFFAOYSA-N chromium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Cr+4] IAQWMWUKBQPOIY-UHFFFAOYSA-N 0.000 description 1
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium(IV) oxide Inorganic materials O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 239000012975 dibutyltin dilaurate Substances 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- POULHZVOKOAJMA-UHFFFAOYSA-M dodecanoate Chemical compound CCCCCCCCCCCC([O-])=O POULHZVOKOAJMA-UHFFFAOYSA-M 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 229940070765 laurate Drugs 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- RBQRWNWVPQDTJJ-UHFFFAOYSA-N methacryloyloxyethyl isocyanate Chemical compound CC(=C)C(=O)OCCN=C=O RBQRWNWVPQDTJJ-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 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 description 1
- 229950000688 phenothiazine Drugs 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 1
- 238000003847 radiation curing Methods 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001228 spectrum 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）
本発明は、オーディオテープ、ビデオテープ、コンピュ
ーターテープ、磁気ディスク、フロッピーディスク、磁
気カー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。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to improving the performance of magnetic recording media used for audio tapes, video tapes, computer tapes, magnetic disks, floppy disks, magnetic cards, etc. , relates to a magnetic recording medium using a binder that is cured by radiation.
（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、えらめ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。(Prior Art) In recent years, for magnetic recording media, radiation-curable resin is mixed and dispersed with magnetic powder and other essential components to prepare a magnetic paint, and the selected magnetic paint is coated on a support.
After drying, radiation curing is performed to form a magnetic layer.
そして、これら放射線硬化性樹脂として、塩化ビニル−
酢酸ビニル−ビニルアルコール共重合体などの水酸基を
有する塩化ビニル系共重合体に、エチレン不飽和基を有
するモノイソシアネート化合物、たとえばトリレンジイ
ソシアネート１モルと２−ヒドロキシエチルアクリレー
ト１モルとの７ダクト体などを反応させて放射線硬化性
樹脂を得たり、または水酸基を存する塩化ビニル系共重
合体と酸無水物を反応させ、その後グリシジルアクリレ
ート化合物を反応させて放射線硬化性樹脂を得たりして
いる。As these radiation-curable resins, vinyl chloride-
A 7-duct compound of a monoisocyanate compound having an ethylenically unsaturated group, such as 1 mole of tolylene diisocyanate and 1 mole of 2-hydroxyethyl acrylate, is added to a vinyl chloride copolymer having a hydroxyl group such as a vinyl acetate-vinyl alcohol copolymer. A radiation-curable resin is obtained by reacting a vinyl chloride copolymer containing a hydroxyl group with an acid anhydride, and then reacting with a glycidyl acrylate compound.
しかしながら、これら放射線硬化性樹脂をバインダとし
て用いた場合、極性基を持たないた分散剤を使用しなけ
ればならず、塗膜物性の低下が生じる。また高分子鎖か
ら長い側鎖を用いてエチレン性不飽和化合物を結合させ
ているため磁性粉の分散性、配向性が不十分であり、高
記録密度化に対して不十分であるという欠点を有してい
る。However, when these radiation-curable resins are used as a binder, a dispersant that does not have a polar group must be used, resulting in a decrease in the physical properties of the coating film. In addition, because the ethylenically unsaturated compound is bonded to the polymer chain using a long side chain, the dispersibility and orientation of the magnetic powder are insufficient, making it unsatisfactory for high recording density. have.
（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たもので、分散性
、配向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。(Problems to be Solved by the Invention) The present invention improves the various drawbacks described above, and provides a magnetic recording medium that is excellent in dispersibility and orientation and is suitable for increasing recording density.
（課題を解決するための手段）
本発明は、水酸基、および水酸基以外の極性基を有する
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（Ｂ）とを反応させ
得られる放射線硬化性樹脂と磁性粉とを含む磁性層が支
持体上に設けられ、放射線により硬化されてなる磁気記
録媒体である。(Means for Solving the Problems) The present invention provides a vinyl chloride copolymer (A) having a hydroxyl group and a polar group other than a hydroxyl group, one or more ethylenically unsaturated double bonds, and an isocyanate (B). A magnetic recording medium is a magnetic recording medium in which a magnetic layer containing a radiation-curable resin obtained by reacting a magnetic powder and a magnetic powder is provided on a support and cured by radiation.
本発明において、水酸基および極性基を有する塩化ビニ
ル系共重合体（Ａ）としては、塩化ビニに一酢酸ビニル
ー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、水酸基の数としては１分子中に３〜
６０個、好ましくは５〜３０個であり、また極性基とし
ては一０８０３Ｍ基、−８０３基、−ＯＰＣ）ａＭ基、
−ＰＯ３Ｍ基、−Ｃ００Ｍ基などがある（Ｍ原子は）１
％ Ｌｉ１Ｎａｓ Ｋ％ ＢａｌＣｓなどを示す。）。In the present invention, the vinyl chloride copolymer (A) having a hydroxyl group and a polar group includes vinyl chloride, vinyl monoacetate-vinyl alcohol copolymer, vinyl chloride-vinyl alcohol copolymer, vinyl chloride-hydroxyalkyl ( meth)acrylate copolymer, vinyl chloride-vinyl acetate-
There are vinyl alcohol-glycidyl (meth)acrylate copolymers, etc., and the number of hydroxyl groups in one molecule is 3 to 3.
The number is 60, preferably 5 to 30, and the polar groups include -803M group, -803 group, -OPC)aM group,
-PO3M group, -C00M group, etc. (M atom) 1
% Li1Nas K% BalCs etc. ).
これらの極性基は１種または２種以上含有させることが
できる。One or more types of these polar groups can be contained.
本発明において、エチレン性不飽和二重結合を１個以上
およびインシアネート基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ー（Ｂ）としては、
２−インシアネートエチル（メタ）アクリレートなどが
ある。この分子の様にインシアネー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, monomers (B) having one or more ethylenically unsaturated double bonds and one incyanate group in one molecule and having no urethane bond in the molecule include:
Examples include 2-incyanate ethyl (meth)acrylate. As in this molecule, the distance between the incyanate group and the acrylic group must be short.
水酸基、および極性基を有する塩化ビニル系共重合体（
Ａ）と七ツマ−（Ｂ）との反応によってウレタン結合に
よりエチレン性不飽和二重結合を導入するが、水酸基お
よびその他の極性基を有する塩化ビニル系共重合体（Ａ
）とモノマー（Ｂ）のモル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。そこで分散性と硬化
性のバランスを取ると、水酸基およびその他の極性基を
存する塩化ビニル系共重合体（Ａ）１分子あたり１〜２
０個、好ましくは２〜１０個のモノマー（Ｂ）を反応さ
せると分散性、硬化性ともに優れた放射線硬化性樹脂を
得ることができる。Vinyl chloride copolymer with hydroxyl group and polar group (
Ethylenically unsaturated double bonds are introduced through urethane bonds by the reaction between A) and 7-mer (B), but vinyl chloride copolymers having hydroxyl groups and other polar groups (A
) and the monomer (B), the radiation curability can be freely designed. However, if the urethane bond concentration is increased too much, dispersibility decreases. Therefore, when balancing dispersibility and curability, 1 to 2 polyvinyl chloride copolymers (A) containing hydroxyl groups and other polar groups are
By reacting 0, preferably 2 to 10 monomers (B), a radiation-curable resin having excellent dispersibility and curability can be obtained.
本発明における、水酸基およびその他の極性基を有する
塩化ビニル系共重合体（Ａ）とモノマー（Ｂ）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水酸
基およびその他の極性基を有する塩化ビニル系共重合体
を溶解させ、公知のウレタン化反応触媒を用い、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 present invention, the reaction between the vinyl chloride copolymer (A) having hydroxyl groups and other polar groups and the monomer (B) can be carried out by adding hydroxyl groups and other polar groups to a known organic solvent that does not participate in the reaction, if necessary. by dissolving the vinyl chloride copolymer containing the polyvinyl chloride copolymer, using a known urethanization reaction catalyst, and using a known radical polymerization inhibitor, such as hydroquinone,
The reaction temperature is 60°C or lower.
本発明において磁性粉としては、γ−Ｆｅ２０．、Ｆｅ
５Ｏ４、γ−Ｆｅ２ＱｓとＦｅ５０．の混晶、コバルト
をドープしたγ−Ｆｅ２０ａ 、コバルトをドープした
Ｆｅ３Ｏ４、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。In the present invention, the magnetic powder is γ-Fe20. , Fe
5O4, γ-Fe2Qs and Fe50. , cobalt-doped γ-Fe20a, cobalt-doped Fe3O4, chromium dioxide, barium ferrite, metal magnetic materials such as iron and cobalt, and various alloy magnetic materials.
上記放射線硬化性樹脂および磁性粉のほかに、ポリエス
テルアクリレート、ポリウレタンアクリレート、エポキ
シアクリレートなどの放射線硬化性樹脂、スチレンなど
の希釈モノマー、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、必要に応じて乾燥した後、放射線照射により硬化さ
せて磁気記録媒体を得る。In addition to the above radiation-curable resin and magnetic powder, radiation-curable resins such as polyester acrylate, polyurethane acrylate, and epoxy acrylate, diluent monomers such as styrene, lubricants, abrasives, antistatic agents, etc. are added to A magnetic recording medium is obtained by providing a magnetic layer on a support by a method, drying if necessary, and curing by irradiation with radiation.
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ート、ポリエチレンナフタレート
、ポリカーボネート、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。Examples of the support used in the magnetic recording medium of the present invention include polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polypropylene, polyvinyl chloride, polyimide, polyamideimide, aluminum alloy, and the like. The thickness of the magnetic layer after coating and drying is usually 2 to 20 μm.
本発明において便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 Ｃ０１１（！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
。Radiation conveniently used in the present invention includes γ-rays using an electron beam C011(! as a source) using an electron beam accelerator as a source, X-rays using an X-ray generator as a source, and ultraviolet rays.
（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
、重量部を表わす。(Example) The present invention will be explained below with reference to Examples. The middle part of the example refers to parts by weight.
合成例 １
塩化ビニル系共重合体ｒＭＲ１１０Ｊ （商品名、日
本ゼオン社製）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アクリル化合物に対して２００
ｐｐｏ＋混合した。その後２−イソシアナートエチルメ
タアクリレート（ＭＯＩ、昭和電工社製）５部、ウレタ
ン化反応触媒のジーｎ−ブチ／Ｌ／チンラウレート（Ｄ
ＢＴＬ）をＭＯＩに対してＬ Ｏ００ｐｐａ＋混合し、
反応温度６０℃で８時間撹拌を行なった。ＩＲスペクト
ルによりインシアネート基の吸収がないことを確認した
。Synthesis Example 1 100 parts of vinyl chloride copolymer rMR110J (trade name, manufactured by Nippon Zeon Co., Ltd.) was dissolved in 200 parts of methyl ethyl ketone and 50 parts of toluene, and then phenothiazine,
200% hydroquinone for each acrylic compound
ppo+ mixed. Thereafter, 5 parts of 2-isocyanatoethyl methacrylate (MOI, manufactured by Showa Denko), di-n-buty/L/tin laurate (D
BTL) is mixed with L O00ppa+ to MOI,
Stirring was performed at a reaction temperature of 60° C. for 8 hours. It was confirmed by IR spectrum that there was no absorption of incyanate groups.
合成例 ２
８０℃に加熱したトリレンジイソシアネート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ート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。Synthesis Example 2 After adding 0.13 parts of hydroquinone to 174 parts of tolylene diisocyanate heated to 80°C, 130 parts of 2-hydroxyethyl methacrylate was gradually added dropwise, and the mixture was reacted at 80°C for 2 hours to form an adduct. I got a body.
塩化ビニル系共重合体ｒＶＲＯＨＪ （商品名、ユニ
オンカーバイド社製）２００部をメチルエチルケトン４
００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ＤＢＴＬを０．１部加えた。６０℃で８時間攪拌し、
工Ｒスペクトルによりイソシアネート基の吸収のないこ
とを確認した。200 parts of vinyl chloride copolymer rVROHJ (trade name, manufactured by Union Carbide) were mixed with 4 parts of methyl ethyl ketone.
00 parts, was dissolved in 180 parts of toluene at 60°C, 50 parts of the obtained adduct body was added thereto, and 0.1 part of DBTL as a urethanization reaction catalyst was added. Stir at 60°C for 8 hours,
It was confirmed by the engineering R spectrum that there was no absorption of isocyanate groups.
合成例 ３
塩化ビニル系共重合体ｒＶＲＯＨ４２００部をメチルエ
チルケトン２９０部に６０℃で溶解させ、次いで無水フ
タル酸２５部、グリシジルメタアクリレート２５部、ハ
イドロキノン０．０２部およびトリエタノールアミン０
．１２部を加え、８０℃で２００時間反応せ、酸価が１
０未満になったのを確認した。Synthesis Example 3 4200 parts of vinyl chloride copolymer rVROH was dissolved in 290 parts of methyl ethyl ketone at 60°C, and then 25 parts of phthalic anhydride, 25 parts of glycidyl methacrylate, 0.02 part of hydroquinone and 0 part of triethanolamine were added.
．． Add 12 parts and react at 80°C for 200 hours until the acid value is 1.
I confirmed that it was less than 0.
実施例 １
成分■
成分■
上記成分■をボールミル中にて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。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５ Ｍｒａｄｌｌ射するこ
とにより硬化させた。Example 1 Component (1) Ingredient (2) The above component (2) was mixed and dispersed in a ball mill for 3 hours, and then the above component (2) was added and mixed and dispersed for 5 hours to obtain a magnetic paint. A magnetic layer was provided by applying the obtained magnetic coating material to a polyester film support having a thickness of 15 μm, and the coating was oriented in a magnetic field and cured by irradiating 5 Mradll of electron beams.
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）の測定を行った。Regarding the obtained magnetic film, surface gloss (gloss 60 degrees) and squareness ratio (
Rs) was measured.
なお、上記の磁性塗料は２４時間放置後も磁性粉の沈殿
やバインダー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。The magnetic paint described above was extremely stable with almost no precipitation of magnetic powder or separation of binder observed even after being left for 24 hours.
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
のかわりに、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。なお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 instead of the solvent solution of the resin obtained in Synthesis Example 1, and a magnetic paint was prepared with the same composition and dispersion conditions. , conducted a similar evaluation. Note that the stability of the magnetic paint was poor.
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。なお、磁性塗料の安定性は不良であ
った。Comparative Example 2 In Example 1, the solvent solution of the resin obtained in Synthesis Example 3 was used instead of the solvent solution of the resin obtained in Synthesis Example 1, and a magnetic paint was prepared with the same composition and dispersion conditions. , conducted a similar evaluation. Note that the stability of the magnetic paint was poor.
得うれた磁気フィルムについて、実施例と比較例との評
価結果を第１−表に示す。Table 1 shows the evaluation results of the obtained magnetic films in Examples and Comparative Examples.
平成２年９月６日September 6, 1990
Claims (1)
共重合体（Ａ）とエチレン性不飽和二重結合を分子中に
持たないモノマー（Ｂ）とを反応させて得られる放射線
硬化性樹脂と磁性粉とを含む磁性層が支持体上に設けら
れ、放射照射線照射により硬化されてなる磁気記録媒体
。Radiation-curable resin and magnetic powder obtained by reacting a vinyl chloride copolymer (A) having a hydroxyl group and a polar group other than a hydroxyl group with a monomer (B) that does not have an ethylenically unsaturated double bond in its molecule A magnetic recording medium comprising: a magnetic layer provided on a support; and cured by irradiation with radiation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2175657A JP3044754B2 (en) | 1990-07-02 | 1990-07-02 | Magnetic recording media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2175657A JP3044754B2 (en) | 1990-07-02 | 1990-07-02 | Magnetic recording media |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11232979A Division JP2000109537A (en) | 1999-08-19 | 1999-08-19 | Radiation curable resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0467314A true JPH0467314A (en) | 1992-03-03 |
| JP3044754B2 JP3044754B2 (en) | 2000-05-22 |
Family
ID=15999935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2175657A Expired - Fee Related JP3044754B2 (en) | 1990-07-02 | 1990-07-02 | Magnetic recording media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3044754B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7001955B2 (en) | 2003-05-28 | 2006-02-21 | Tdk Corporation | Electron beam curing resin for magnetic recording medium, method for manufacturing the same, and magnetic recording medium including the same |
| US7026371B2 (en) | 2002-03-29 | 2006-04-11 | Tdk Corporation | Electron beam curable urethane resin for magnetic recording medium, method of manufacturing the same, and magnetic recording medium using the same |
| JP2011046930A (en) * | 2009-07-31 | 2011-03-10 | Fujifilm Corp | Radiation-curable vinyl chloride resin composition and method for producing the same, vinyl chloride resin, magnetic recording medium, and preservation stabilizer for radiation-curable vinyl chloride resin |
-
1990
- 1990-07-02 JP JP2175657A patent/JP3044754B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7026371B2 (en) | 2002-03-29 | 2006-04-11 | Tdk Corporation | Electron beam curable urethane resin for magnetic recording medium, method of manufacturing the same, and magnetic recording medium using the same |
| US7001955B2 (en) | 2003-05-28 | 2006-02-21 | Tdk Corporation | Electron beam curing resin for magnetic recording medium, method for manufacturing the same, and magnetic recording medium including the same |
| JP2011046930A (en) * | 2009-07-31 | 2011-03-10 | Fujifilm Corp | Radiation-curable vinyl chloride resin composition and method for producing the same, vinyl chloride resin, magnetic recording medium, and preservation stabilizer for radiation-curable vinyl chloride resin |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3044754B2 (en) | 2000-05-22 |
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