JPH04201399A - Magnetic thermal recording medium - Google Patents
Magnetic thermal recording mediumInfo
- Publication number
- JPH04201399A JPH04201399A JP2333582A JP33358290A JPH04201399A JP H04201399 A JPH04201399 A JP H04201399A JP 2333582 A JP2333582 A JP 2333582A JP 33358290 A JP33358290 A JP 33358290A JP H04201399 A JPH04201399 A JP H04201399A
- Authority
- JP
- Japan
- Prior art keywords
- recording layer
- magnetic
- metal particles
- thermal recording
- layer
- 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
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- 108010010803 Gelatin Proteins 0.000 description 1
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- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
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- JPIYZTWMUGTEHX-UHFFFAOYSA-N auramine O free base Chemical compound C1=CC(N(C)C)=CC=C1C(=N)C1=CC=C(N(C)C)C=C1 JPIYZTWMUGTEHX-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
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- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000005018 casein Substances 0.000 description 1
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 1
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- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Magnetic Record Carriers (AREA)
- Credit Cards Or The Like (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は磁気感熱記録媒体に係り、特に感熱記録層の印
字適性が良好な磁気感熱記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a magnetic thermosensitive recording medium, and particularly to a magnetic thermosensitive recording medium whose thermosensitive recording layer has good printing suitability.
近年、公衆電話の利用、乗車券の購入あるいは買い物等
の広い分野でプリペイドカードが使用されている。従来
のプリペイドカードは基材上に磁気記録層を有し、この
磁気記録層に券種、使用状況等を記録するものであった
らしかし、使用状況等を目視して確認できるようなプリ
ペイドカードの要望があった。このため、磁気記録層と
感熱記 −録層とを有し、磁気記録層には磁気ヘッドに
よる記録を行うとともに、感熱記録層にはサーマルヘッ
ドにより各種情報、利用状況等の可視情報を記録するこ
とのできる磁気感熱記録媒体か開発されている。従来、
このような磁気感熱記録媒体の構成は、一般に基材の片
面に磁気記録層、隠蔽層、感熱記録層および保護層を積
層したものである。In recent years, prepaid cards have been used in a wide range of fields such as using public telephones, purchasing tickets, and shopping. Conventional prepaid cards have a magnetic recording layer on the base material, and this magnetic recording layer records the ticket type, usage status, etc. However, prepaid cards that allow you to visually confirm usage status, etc. There was a request. For this reason, it has a magnetic recording layer and a thermosensitive recording layer, and the magnetic recording layer performs recording with a magnetic head, and the thermosensitive recording layer records various information and visible information such as usage status with a thermal head. A magnetic thermosensitive recording medium capable of Conventionally,
The structure of such a magnetic thermosensitive recording medium is generally such that a magnetic recording layer, a hiding layer, a thermosensitive recording layer, and a protective layer are laminated on one side of a base material.
そして隠蔽層は、磁気記録層の磁性粉末による茶褐色あ
るいは黒色を隠蔽して感熱記録層における記録（通常、
黒色の感熱発色）をより認識し易いようにするためのも
のである。この隠蔽層は、−般に金属粒子を含有する塗
料を塗布して形成されたり、あるいは金属を蒸着して形
成される。The hiding layer hides the brown or black color caused by the magnetic powder in the magnetic recording layer, and hides the recording (usually
This is to make it easier to recognize black heat-sensitive coloring. This hiding layer is generally formed by applying a paint containing metal particles, or by vapor depositing a metal.
しかしながら、上述のような従来の磁気感熱記録媒体で
は隠蔽層の平滑性が低く、この隠蔽層の上に形成される
感熱記録層の平滑性も不充分なものとなっていた。この
ため、サーマルヘッドによる感熱記録層の記録において
、サーマルヘッドと感熱記録層との距離が微妙に変動し
て細線がかすれたり、図形の輪郭がシャープでなくなり
、記録解像度が低下してしまうという問題があった。However, in the conventional magnetic thermosensitive recording medium as described above, the smoothness of the hiding layer is low, and the smoothness of the thermosensitive recording layer formed on the hiding layer is also insufficient. For this reason, when recording on a heat-sensitive recording layer using a thermal head, the distance between the thermal head and the heat-sensitive recording layer changes slightly, causing thin lines to become blurred, the contours of figures to become less sharp, and the recording resolution to decline. was there.
本発明は、上述のような事情に鑑みてなされたものであ
り、磁気記録層か良好に隠蔽されて感熱記録層上の記録
の認識性か高いとともに、感熱記録層の解像度か高く印
字適性に優れた磁気感熱記録媒体を提供することを目的
とする。The present invention has been made in view of the above-mentioned circumstances, and the magnetic recording layer is well concealed and the recording on the heat-sensitive recording layer is highly recognizable, and the resolution of the heat-sensitive recording layer is high, making it suitable for printing. The purpose is to provide an excellent magnetic thermosensitive recording medium.
このような目的を達成するために、本発明は基材と、該
基材の片側の面に磁気記録層、感熱記録層および保護層
がこの順に積層され、前記感熱記録層が金属粒子を含有
するような構成とした。In order to achieve such an object, the present invention comprises a base material, a magnetic recording layer, a heat-sensitive recording layer, and a protective layer laminated in this order on one side of the base material, and the heat-sensitive recording layer contains metal particles. It was configured so that
基材の片面に設けられた磁気記録層上に設けられた感熱
記録層は金属粒子を含有し、この金属粒子は感熱記録層
の下方に集まることにより磁気記録層が良好に隠蔽され
、さらに金属粒子による凹凸は感熱記録層内で吸収され
て感熱記録層の表面は平滑度の高いものとなり、保護層
を介してサーマルヘッドによる感熱記録層の記録が行わ
れても、サーマルヘッドと感熱記録層との距離が変動す
ることがなく印字適性が大幅に向上する。The heat-sensitive recording layer provided on the magnetic recording layer provided on one side of the base material contains metal particles, and the metal particles gather below the heat-sensitive recording layer to effectively hide the magnetic recording layer, and furthermore, the metal particles The unevenness caused by the particles is absorbed within the heat-sensitive recording layer, and the surface of the heat-sensitive recording layer becomes highly smooth. There is no change in the distance between the printer and the printer, which greatly improves printing suitability.
以下、本発明の実施例について図面を参照して説明する
。Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明の磁気感熱記録媒体の一実施例を示す概
略断面図である。箪１図において、磁気感熱記録媒体１
は基材２と、この基材２の片面に設けられた磁気記録層
３と、磁気記録層３上に積層された感熱記録層４と、感
熱記録層４上に積層された保護層５とを備えるような構
成を有している。FIG. 1 is a schematic sectional view showing an embodiment of the magnetic thermosensitive recording medium of the present invention. In Figure 1, magnetic thermosensitive recording medium 1
is a base material 2, a magnetic recording layer 3 provided on one side of this base material 2, a thermosensitive recording layer 4 laminated on the magnetic recording layer 3, and a protective layer 5 laminated on the thermosensitive recording layer 4. It has a configuration that includes.
本発明は、磁気記録層３上に設けた感熱記録層４に金属
粒子を含有させることにより、磁気記録層３を隠蔽し、
なお且つ感熱記録層４の表面平滑度を大幅に向上するこ
とを最大の特徴とする。すなわち、感熱記録層４に含有
される金属粒子はバインダーに比べて比重が大きいため
感熱記録層４の下方（磁気記録層３との界面近傍）に集
まり、磁気記録層３の磁性粉末による茶褐色あるいは黒
色が隠蔽されて感熱記録層４における記録（通常、黒色
の感熱発色）がより認識し易いものとなる。The present invention hides the magnetic recording layer 3 by containing metal particles in the heat-sensitive recording layer 4 provided on the magnetic recording layer 3,
Furthermore, the greatest feature is that the surface smoothness of the heat-sensitive recording layer 4 is greatly improved. That is, since the metal particles contained in the heat-sensitive recording layer 4 have a higher specific gravity than the binder, they gather below the heat-sensitive recording layer 4 (near the interface with the magnetic recording layer 3), and the metal particles are brown or brown due to the magnetic powder of the magnetic recording layer 3. The black color is hidden, and the recording (usually black heat-sensitive coloring) on the heat-sensitive recording layer 4 becomes easier to recognize.
また、このような金属粒子により形成される凹凸は、感
熱記録層４内で金属粒子の上方に存在するバインダーに
よって吸収され、感熱記録層４の表面に凹凸を生じるこ
とか防止される。したがって、感熱記録層４は平滑度の
高いものとなる。Moreover, the unevenness formed by such metal particles is absorbed by the binder present above the metal particles in the heat-sensitive recording layer 4, and the occurrence of unevenness on the surface of the heat-sensitive recording layer 4 is prevented. Therefore, the heat-sensitive recording layer 4 has high smoothness.
このような感熱記録層４は、フェノール性化合物（顕色
剤）と、このフェノール性化合物と加熱下で反応して発
色するロイコ染料（発色剤）と、金属粒子とをバインダ
ー中に含有する感熱記録インキをグラビアコート、シル
クスクリーン等の公知のコート方法によって塗布するこ
とにより形成される。Such a heat-sensitive recording layer 4 is a heat-sensitive recording layer containing a phenolic compound (color developer), a leuco dye (color former) that reacts with the phenolic compound under heating to form a color, and metal particles in a binder. It is formed by applying recording ink using a known coating method such as gravure coating or silk screen.
金属粒子は一般に平板状であり、平均粒子径は６〜１５
μｍ程度であり、１０〜４０重量％の範囲で感熱記録層
４に含有される。金属粒子としてはアルミニウム粒子あ
るいはアルミニウムペーストを使用できる。ここでアル
ミニウムペーストは、アルミニウム粒子を、ステアリン
酸あるいはオレイン酸、およびミネラルスプリット等の
添加剤とともにボールミル等の粉砕機で粉砕攪拌したも
のである。また、感熱記録層４には金属粒子の他に、焼
成カオリン、タルク、炭酸カルシウム、水酸化アルミニ
ウム、水酸化マグネシウム、シリカ、ケイソウ土、尿素
−ホルマリンフィラー、セルロースフィラー等が２０〜
５０重量％の範囲で含有されてもよい。Metal particles are generally tabular and have an average particle size of 6 to 15
It is on the order of μm and is contained in the heat-sensitive recording layer 4 in a range of 10 to 40% by weight. Aluminum particles or aluminum paste can be used as the metal particles. The aluminum paste is obtained by grinding and stirring aluminum particles together with stearic acid or oleic acid, and additives such as mineral split using a grinder such as a ball mill. In addition to the metal particles, the heat-sensitive recording layer 4 also contains 20 to 30% of calcined kaolin, talc, calcium carbonate, aluminum hydroxide, magnesium hydroxide, silica, diatomaceous earth, urea-formalin filler, cellulose filler, etc.
It may be contained in a range of 50% by weight.
ロイコ染料としては、フルオラン系、トリフェニルメタ
ン系、フェノチアジン系、オーラミン系、スピロピラン
系等の従来より感熱記録に使用されている公知のロイコ
染料を使用することができ、この中でもフルオラン系が
好ましい。フルオラン系ロイコ染料としては、１，２−
ベンゾ−６−シエチルアミノフルオラン、３−ジエチル
アミノ−７−ジベンジルアミノフルオラン、３−ジエチ
ルアミノ−７−オクチルアミノフルオラン、３−ジエチ
ルアミノ−７−３，４−ジクロロアリニノフルオラン、
３−ジエチルアミノ−７−（２−クロロアリ二））フル
オラン、３−ジエチルアミノ−６−メチル−７−アニリ
ノフルオラン、３−ピペリジノ−６−メチル−７−アニ
リノフルオラン、３−エチル−トリルアミノ−６−メチ
ル−７−アニリノフルオラン、３−エチル−トリルアミ
ノ−６−メチル−７−フェニルフェノール、３−ジエチ
ルアミノ−７−（４−ニトロアニリノ）フルオラン等が
挙げられ、これらの１種または２種以上を用いることが
できる。As the leuco dye, known leuco dyes conventionally used in heat-sensitive recording, such as fluoran-based, triphenylmethane-based, phenothiazine-based, auramine-based, and spiropyran-based dyes, can be used, and among these, fluoran-based dyes are preferred. Fluorane leuco dyes include 1,2-
Benzo-6-ethylaminofluorane, 3-diethylamino-7-dibenzylaminofluorane, 3-diethylamino-7-octylaminofluorane, 3-diethylamino-7-3,4-dichloroalininofluorane,
3-diethylamino-7-(2-chloroalini))fluorane, 3-diethylamino-6-methyl-7-anilinofluorane, 3-piperidino-6-methyl-7-anilinofluorane, 3-ethyl-tolylamino -6-methyl-7-anilinofluoran, 3-ethyl-tolylamino-6-methyl-7-phenylphenol, 3-diethylamino-7-(4-nitroanilino)fluoran, etc., and one or two of these More than one species can be used.
フェノール性化合物としては、０−フタル酸、ジヒドロ
キシ安息香酸、没食子酸、ビスレゾルシノールエチレン
エーテル、ジレゾルシノール、β−レゾルシン酸エタノ
ールアミド、没食子酸メチル、没食子酸エチル、０−ヨ
ード安息香酸、ヒドロキシナフトエ酸、アセトアセトア
ミノサリチル酸、アセトアセトアミノ−クロロ−メチル
ベンゼンスルホン酸、トリカルバミン酸、２．、６−ト
リヒドロキシ安息香酸、ｐ−オクチルフェノール、ｐ−
ｔｅｒｔ−ブチルフェノール、ｐ−フェニルフェノール
、１，１−ビス（ｐ−ヒドロキシフェニル）プロパン等
が挙げられ、これらの１種または２種以上を用いること
ができる。Phenolic compounds include 0-phthalic acid, dihydroxybenzoic acid, gallic acid, bisresorcinol ethylene ether, diresorcinol, β-resorcinol ethanolamide, methyl gallate, ethyl gallate, 0-iodobenzoic acid, and hydroxynaphthoic acid. , acetoacetaminosalicylic acid, acetoacetamino-chloro-methylbenzenesulfonic acid, tricarbamic acid, 2. , 6-trihydroxybenzoic acid, p-octylphenol, p-
Examples include tert-butylphenol, p-phenylphenol, 1,1-bis(p-hydroxyphenyl)propane, and one or more of these can be used.
感熱記録インキに用いるバインダーとしては、ポリビニ
ルアルコール、変性ポリビニルアルコール、ポリメチル
メタクリレート、ポリエチルメタクリレート、ポリブチ
ルメタクリレート、メチルセルロース、ヒドロキシエチ
ルセルロース、エチレン−無水マレイン酸共重合体、ス
チレン−無水マレイン酸共重合体、イソブチレン−無水
マレイン酸共重合体、ポリビニルピロリドン、デンプン
誘導体、カゼイン、ゼラチン等を用いることかできる。Binders used in thermal recording inks include polyvinyl alcohol, modified polyvinyl alcohol, polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate, methyl cellulose, hydroxyethyl cellulose, ethylene-maleic anhydride copolymer, styrene-maleic anhydride copolymer. , isobutylene-maleic anhydride copolymer, polyvinylpyrrolidone, starch derivatives, casein, gelatin, etc. can be used.
また、感熱記録インキには公知の種々の助剤を添加する
ことができる。Further, various known auxiliary agents can be added to the heat-sensitive recording ink.
このような感熱記録インキの塗布により形成される感熱
記録層４の厚さは４〜８μｍ程度が好ましい。The thickness of the heat-sensitive recording layer 4 formed by applying such heat-sensitive recording ink is preferably about 4 to 8 μm.
基材２としては、ポリプロピレン、ポリエチレンテレフ
タレート等のポリエステル樹脂フィルム、硬質塩化ビニ
ル、硬質塩化ビニル−酢酸ビニル共重合体、ポリスチレ
ン等の合成樹脂フィルム、紙、あるいはこれらの複合基
材等を使用することができる。基材２の厚さは磁気感熱
記録媒体の用途に応じて適宜法めることができる。また
、合成樹脂フィルムには界面活性剤、導電性カーボンブ
ラック、蛍光増白剤、金属粉末等を含有させてもよい。As the base material 2, a polyester resin film such as polypropylene or polyethylene terephthalate, a hard vinyl chloride, a hard vinyl chloride-vinyl acetate copolymer, a synthetic resin film such as polystyrene, paper, or a composite base material thereof may be used. I can do it. The thickness of the base material 2 can be determined as appropriate depending on the use of the magnetic thermosensitive recording medium. Further, the synthetic resin film may contain a surfactant, conductive carbon black, fluorescent whitening agent, metal powder, etc.
磁気記録層３は、γ−酸化鉄、コバルトγ−酸化鉄、バ
リウムフェライト等の公知の磁性粉末をバインダー中に
含有した磁気インキを上記の基材上にグラビアコート、
ロールコート、コンマコート、ダイコート、ナイフコー
ト、シルクスクリーン等の公知のコート方法によって塗
布することにより形成される。磁気インキに使用される
バインダーとしては、ポリビニルアルコール、スチレン
・ブタジェン共重合体、メチルメタアクリレート・ブタ
ジェン共重合体、スチレン・ブタジェン・メチルメタア
クリレート共重合体、アクリル系樹脂、酢酸ビニル系樹
脂等のラテックスエマルジョンあるいはポリウレタン樹
脂、塩化ビニル樹脂、ポリエステル樹脂等を挙げること
ができる。このような磁気記録層３の厚さは１０〜１５
μｍ程度が好ましい。The magnetic recording layer 3 is formed by gravure coating the above base material with a magnetic ink containing a known magnetic powder such as γ-iron oxide, cobalt γ-iron oxide, barium ferrite, etc. in a binder.
It is formed by coating using a known coating method such as roll coating, comma coating, die coating, knife coating, or silk screen. Binders used in magnetic ink include polyvinyl alcohol, styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer, styrene-butadiene-methyl methacrylate copolymer, acrylic resin, vinyl acetate resin, etc. Examples include latex emulsion, polyurethane resin, vinyl chloride resin, and polyester resin. The thickness of such a magnetic recording layer 3 is 10 to 15
The thickness is preferably about μm.
感熱記録層４上に積層される保護層５は、感熱記録層４
の保存性を向上するためのものであり、ポリビニルアル
コール等の水溶性バインダーあるいは溶剤系バインダー
中に有機顔料等の色剤、酸化防止剤、滑剤等の添加剤を
含有するインキを感熱記録層４上に塗布して形成される
。また、保護層６は紫外線硬化型インキを塗布して硬化
することにより形成してもよい。この場合、紫外線硬化
型インキは、感光性樹脂であるプレポリマーと、光反応
性希釈剤であるモノマーでビヒクルを構成し、これに光
増感剤を加えてインキ化し、上記の色剤、添加剤等を含
有させたものである。このように紫外線硬化型インキを
用いて保護層５を形成することにより、水溶性インキを
用いるよりも工程スピードを上げることができ、また溶
剤系インキのような火災の危険性がなく、加熱乾燥方式
に比べてエネルギーの節約ができる。このような保護層
５の厚さは２〜４μｍ程度が好ましい。また、水溶性イ
ンキの上に紫外線硬化型インキを積層して形成してもよ
い。The protective layer 5 laminated on the heat-sensitive recording layer 4 is
The heat-sensitive recording layer 4 is an ink containing additives such as coloring agents such as organic pigments, antioxidants, and lubricants in a water-soluble binder such as polyvinyl alcohol or a solvent-based binder. It is formed by coating on top. Further, the protective layer 6 may be formed by applying and curing ultraviolet curable ink. In this case, the UV-curable ink consists of a vehicle consisting of a prepolymer, which is a photosensitive resin, and a monomer, which is a photoreactive diluent, and a photosensitizer is added to this to form an ink, and the above colorant and additives It contains agents, etc. By forming the protective layer 5 using ultraviolet curable ink in this way, the process speed can be increased compared to using water-soluble ink, and there is no risk of fire like with solvent-based ink, and heat drying is possible. It can save energy compared to other methods. The thickness of such a protective layer 5 is preferably about 2 to 4 μm. Alternatively, an ultraviolet curable ink may be layered on top of a water-soluble ink.
そして、本発明の磁気感熱記録媒体の磁気記録層３上に
設けられる感熱記録層４および保護層５の全体の厚さは
８〜１１μｍの範囲にあることか好ましい。これにより
、磁気記録層３と磁気ヘッドとのスペースロスか小さく
なり、電磁変換特性における分離損失を低（することが
できる。The total thickness of the thermosensitive recording layer 4 and the protective layer 5 provided on the magnetic recording layer 3 of the magnetic thermosensitive recording medium of the present invention is preferably in the range of 8 to 11 μm. As a result, the space loss between the magnetic recording layer 3 and the magnetic head is reduced, and separation loss in electromagnetic conversion characteristics can be reduced.
さらに、本発明では感熱記録層４にカレンダープレス加
工を施してもよい。カレンダープレス加工はスーパーカ
レンダー、グロスカレンダー等の公知の手段により行う
ことができる。このようにカレンダープレス加工を施す
ことにより、磁気感熱記録媒体１の表面平滑性をさらに
向上させることができる。Furthermore, in the present invention, the heat-sensitive recording layer 4 may be subjected to calendar press processing. Calendar press processing can be performed by known means such as a super calender and a gloss calender. By performing calendar press processing in this manner, the surface smoothness of the magnetic thermosensitive recording medium 1 can be further improved.
また、第２図は本発明の磁気感熱記録媒体の他の実施例
を示す概略断面図である。第２図に示されるように、磁
気感熱記録媒体１′は第１ｖ！Ｊに示される磁気感熱記
録媒体の基材２の他の面にも、磁気記録層３′、感熱記
録層４′および保護層５′を同様に備えるような構成で
ある。このような構成とすることにより、磁気感熱記録
媒体の両面に磁気記録と感熱記録が可能となる。Further, FIG. 2 is a schematic cross-sectional view showing another embodiment of the magnetic thermosensitive recording medium of the present invention. As shown in FIG. 2, the magnetic thermosensitive recording medium 1' is 1v! The magnetic recording layer 3', the thermosensitive recording layer 4', and the protective layer 5' are similarly provided on the other surface of the base material 2 of the magnetic thermosensitive recording medium shown in J. With such a configuration, magnetic recording and thermosensitive recording can be performed on both sides of the magnetic thermosensitive recording medium.
さらに、第３図は本発明の磁気感熱記録媒体の他の実施
例を示す概略断面図である。第３図に示されるように、
磁気感熱記録媒体１″は第１図に示される磁気感熱記録
媒体の基材２の他の面に、感熱記録層４′および保護層
５′とを同様に備えるような構成である。このような構
成とすることにより、磁気感熱記録媒体の裏面にも感熱
記録が可能となり、可視情報等の表示エリアが拡大され
る。尚、この場合、基材２の他の面には磁気記録層が存
在しないため、感熱記録層４′には金属粒子が含有され
ていな（でもよい。Furthermore, FIG. 3 is a schematic cross-sectional view showing another embodiment of the magnetic thermosensitive recording medium of the present invention. As shown in Figure 3,
The magnetic thermosensitive recording medium 1'' has a structure in which a thermosensitive recording layer 4' and a protective layer 5' are similarly provided on the other side of the base material 2 of the magnetic thermosensitive recording medium shown in FIG. By adopting this structure, it is possible to perform thermal recording on the back side of the magnetic thermal recording medium, and the display area for visible information, etc. is expanded.In this case, the other side of the base material 2 has a magnetic recording layer. Since no metal particles are present, the heat-sensitive recording layer 4' may not contain metal particles.
つぎに、実験例を示して本発明をさらに詳細に−説明す
る。Next, the present invention will be explained in more detail by showing experimental examples.
（実験例）
試料−１
基材として厚さ１８８μｍのポリエチレンテレフタレー
トフィルム（東しく株）製ルミラーＥ−２２）に下記の
組成の磁気インキを用いグラビアロールコートにより磁
気記録層（厚さ１４μｍ）を形成した。(Experiment example) Sample-1 A magnetic recording layer (thickness: 14 μm) was applied to a polyethylene terephthalate film (Lumirror E-22, manufactured by Toshiku Co., Ltd.) with a thickness of 188 μm as a base material by gravure roll coating using a magnetic ink with the following composition. Formed.
磁気インキの組成
・バリウムフェライト ７５重量部・部分ケ
ン化塩化ビニル−酢酸ビニル
共重合体樹脂 １０重量部・ポリウレ
タンエラストマー樹脂 １０重量部・ポリエステル樹脂
５重量部・メチルイソブチルケトン
６５重量部・トルエン ６
５重量部つぎに、上記の磁気記録層上に金属粒子を含有
する下記の組成の感熱記録インキを用いグラビアロール
コートにより感熱記録層（厚さ７μｍ）を形成し、この
感熱記録層上に下記の組成の保護層用インキを用いてグ
ラビアロールコートにより保護層（厚さ３μｍ）を形成
して第１図に示されるような磁気感熱記録媒体（試料−
１）を作成した。Composition of magnetic ink - Barium ferrite 75 parts by weight - Partially saponified vinyl chloride-vinyl acetate copolymer resin 10 parts by weight - Polyurethane elastomer resin 10 parts by weight - Polyester resin 5 parts by weight - Methyl isobutyl ketone
65 parts by weight・Toluene 6
5 parts by weight Next, a heat-sensitive recording layer (thickness: 7 μm) was formed on the above magnetic recording layer by gravure roll coating using a heat-sensitive recording ink containing metal particles and having the composition shown below. A protective layer (thickness: 3 μm) was formed by gravure roll coating using a protective layer ink having a composition of
1) was created.
感熱記録インキの組成
［Ａ液］
・フルオラン系ロイコ染料（保土谷化学製ＴＨ−１０６
） ３重量部・アルミニウムペース
ト５ａｐ２１７１（昭和アルミパウダー製）
２重量部・ポリメチルメタクリレート樹脂 １０重量部
・トルエン ５重量部［Ｂ液］
・０−フタル酸 ３重量部・ポリメ
チルメタクレート樹脂 １０重量部・トルエン
５重量部（Ａ液・Ｂ液：トルエンを
１：１：１の割合に混合し、プロペラミキサーで攪拌し
た。）保護層用インキの組成
・ポリビニルアルコール１０％水溶液
１００重量部
・シリカ ５重量部・滑剤
１重量部・水
５０重量部・架橋剤
４０重量部試料−２
感熱記録層を形成した後、スーパーカレンダーによりカ
レンダープレス加工（プレス圧（線圧）３００ ｋｇ／
’ａｎ）を施した他は試料−１と同様にして磁気感熱記
録媒体（試料−２）を作成した。Composition of thermal recording ink [Liquid A] Fluorane-based leuco dye (TH-106 manufactured by Hodogaya Chemical Co., Ltd.)
) 3 parts by weight Aluminum paste 5ap2171 (manufactured by Showa Aluminum Powder)
2 parts by weight polymethyl methacrylate resin 10 parts by weight toluene 5 parts by weight [Liquid B] 0-phthalic acid 3 parts by weight polymethyl methacrylate resin 10 parts by weight toluene
5 parts by weight (Liquid A/B: toluene were mixed in a ratio of 1:1:1 and stirred with a propeller mixer.) Composition of ink for protective layer - 100 parts by weight of 10% polyvinyl alcohol aqueous solution - 5 parts by weight of silica・Lubricant
1 part by weight/water
50 parts by weight/crosslinking agent
40 parts by weight Sample-2 After forming the heat-sensitive recording layer, calendar press processing was performed using a super calendar (press pressure (linear pressure) 300 kg/
A magnetic thermosensitive recording medium (Sample-2) was prepared in the same manner as Sample-1 except that 'an) was applied.
試料−３
紫外線硬化型の保護層用インキ（諸態インキ製ＵＶ５−
ＯＰニス）を用いてＵＶオフセット印刷により保護層（
厚さ３μｍ）を形成した他は試料−１と同様にして磁気
感熱記録媒体（試料−３）を作成した。Sample-3 Ultraviolet curing ink for protective layer (UV5- made by Shishou Ink)
Protective layer (OP varnish) is applied by UV offset printing using
A magnetic thermosensitive recording medium (Sample-3) was prepared in the same manner as Sample-1 except that a thickness of 3 μm was formed.
比較試料
試料−１と同様にして磁気記録層を形成し、磁気記録層
上に下記の組成の隠蔽用インキを用いグラビアロールコ
ートにより隠蔽層（厚さ３μｍ）を形成し、この隠蔽層
上に金属粒子を含有しない下記の組成の感熱記録インキ
を用いてグラビアロールコートにより感熱記録層（厚さ
４μｍ）を形成し、最後に試料−１と同様にして保護層
を形成し磁気感熱記録媒体（比較試料）を作成した。A magnetic recording layer was formed in the same manner as Comparative Sample Sample-1, and a concealing layer (thickness: 3 μm) was formed on the magnetic recording layer by gravure roll coating using a concealing ink having the composition shown below. A thermosensitive recording layer (thickness: 4 μm) was formed by gravure roll coating using a thermosensitive recording ink containing no metal particles and having the composition shown below.Finally, a protective layer was formed in the same manner as Sample-1, and a magnetic thermosensitive recording medium ( A comparison sample) was prepared.
隠蔽層用インキの組成
・アルミニウムペースト５ａｐ２１７１（昭和アルミパ
ウダー製） ２０重量部・塩化ビニル樹脂
４０重量部・酢酸ビニル樹脂
４０重量部・メチルイソブチルケトン １０重量
部・トルエン １０重量部感熱
記録インキの組成
［Ａ液］
・フルオラン系ロイコ染料（保土谷化学製ＴＨ−１０６
） ３重量部・ポリメチルメタク
リレート３０％
トルエン溶液（三菱レーヨン製ダイヤナールＢＲ−８２
） １０重量部・トルエン
５重量部［Ｂ液コ
・０−フタル酸 ３重量部・ポリメ
チルメタクリレート３０％
トルエン溶液（三菱レーヨン製ダイヤナールＢＲ−８２
） １０重量部・トルエン
５重量部（Ａ液、Ｂ液：トルエン
を１：１：１の割合に混合し、プロペラミキサーで攪拌
した。）つぎに、上記のように作成した試料−１〜３お
よび比較試料について、感熱プリンター（東芝（株）製
サーマルヘッド使用）により印字を行った。また、磁気
記録装置により書き込み、および読み取りを行った。そ
の結果、本発明の磁気感熱記録媒体である試料−１〜３
は、いずれも優れた印字適性を有するとともに、良好な
磁気特性を示した。また、カレンダープレス加工を施す
ことにより（試料−２）、印字適性が更に向上すること
が明らかとなった。これに対して、比較試料の印字適性
は低く、本発明において感熱記録層に金属粒子を含有さ
せたことによる磁気感熱記録媒体の平滑性向上の効果が
明らかであった。Composition of ink for hiding layer - Aluminum paste 5ap2171 (manufactured by Showa Aluminum Powder) 20 parts by weight - Vinyl chloride resin
40 parts by weight/vinyl acetate resin
40 parts by weight Methyl isobutyl ketone 10 parts by weight Toluene 10 parts by weight Composition of thermal recording ink [Liquid A] Fluoran leuco dye (Hodogaya Chemical TH-106)
) 3 parts by weight, 30% polymethyl methacrylate toluene solution (Dyanal BR-82 manufactured by Mitsubishi Rayon)
) 10 parts by weight, toluene
5 parts by weight [Liquid B, 3 parts by weight of 0-phthalic acid, 30% polymethyl methacrylate, toluene solution (Dyanal BR-82 manufactured by Mitsubishi Rayon)
) 10 parts by weight, toluene
5 parts by weight (liquid A, liquid B: toluene were mixed in a ratio of 1:1:1 and stirred with a propeller mixer.) Next, samples 1 to 3 and a comparative sample prepared as above were subjected to heat-sensitive Printing was performed using a printer (using a thermal head manufactured by Toshiba Corporation). Further, writing and reading were performed using a magnetic recording device. As a result, Samples-1 to 3, which are magnetic thermosensitive recording media of the present invention, were
Both had excellent printing aptitude and exhibited good magnetic properties. Furthermore, it was revealed that the printing suitability was further improved by applying calendar press processing (Sample-2). On the other hand, the printing suitability of the comparative sample was low, and the effect of improving the smoothness of the magnetic thermosensitive recording medium by containing metal particles in the thermosensitive recording layer in the present invention was clear.
以上詳述したように、本発明によれば基材の片面に設け
られた磁気記録層上に磁気記録層の隠蔽を目的とした金
属粒子を含有した感熱記録層が積層され、磁気記録層は
この金属粒子により有効に隠蔽され、さらに金属粒子に
よる凹凸は感熱記録層内で吸収されて感熱記録層の表面
は平滑度の高いものとなる。これにより、サーマルヘッ
ドによる感熱記録層の記録において、サーマルヘッドと
感熱記録層との距離が変動することがなく解像度が向上
して印字適性か大幅に改良されるという効果が奏される
。As detailed above, according to the present invention, a heat-sensitive recording layer containing metal particles for the purpose of hiding the magnetic recording layer is laminated on the magnetic recording layer provided on one side of the base material, and the magnetic recording layer is The unevenness caused by the metal particles is effectively hidden by the metal particles, and the unevenness caused by the metal particles is absorbed within the heat-sensitive recording layer, resulting in a highly smooth surface of the heat-sensitive recording layer. As a result, in recording on the heat-sensitive recording layer by the thermal head, the distance between the thermal head and the heat-sensitive recording layer does not change, the resolution is improved, and the printing suitability is greatly improved.
第１図は本発明の磁気感熱記録媒体の一実施例を示す概
略断面図、第２図は本発明の磁気感熱記録媒体の他の実
施例を示す概略断面図、第３図は本発明の磁気感熱記録
媒体の他の実施例を示す概略断面図である。
１．１’ 、１’・・・磁気感熱記録媒体、２・・・基
材、３．３′・・・磁気記録層、、４’ 、４’・・・
感熱記録層、５．５’ 、５’・・・保護層。
出願人代理人 石 川 泰 実弟１図
第２図
第３図FIG. 1 is a schematic sectional view showing one embodiment of the magnetic thermosensitive recording medium of the present invention, FIG. 2 is a schematic sectional view showing another embodiment of the magnetic thermosensitive recording medium of the present invention, and FIG. FIG. 3 is a schematic cross-sectional view showing another example of a magnetic thermosensitive recording medium. 1.1', 1'...Magnetic thermosensitive recording medium, 2...Base material, 3.3'...Magnetic recording layer, 4', 4'...
Thermosensitive recording layer, 5.5', 5'...protective layer. Applicant's representative Yasushi Ishikawa Younger brother Figure 1 Figure 2 Figure 3
Claims (1)
層および保護層がこの順に積層され、前記感熱記録層が
金属粒子を含有することを特徴とする磁気感熱記録媒体
。 ２、前記基材の他の面に磁気記録層、感熱記録層および
保護層がこの順に積層され、前記感熱記録層が金属粒子
を含有することを特徴とする請求項１に記載の磁気感熱
記録媒体。 ３、前記基材の他の面に感熱記録層および保護層がこの
順に積層されたことを特徴とする請求項１に記載の磁気
感熱記録媒体。 ４、前記感熱記録層にカレンダープレス加工が施されて
いることを特徴とする請求項１乃至請求項３に記載の磁
気感熱記録媒体。 ５、前記保護層が紫外線硬化型インキを塗布して硬化さ
せたものであることを特徴とする請求項１乃至請求項４
に記載の磁気感熱記録媒体。[Claims] 1. A base material, and a magnetic recording layer, a heat-sensitive recording layer, and a protective layer are laminated in this order on one side of the base material, and the heat-sensitive recording layer contains metal particles. A magnetic thermosensitive recording medium. 2. The magnetic thermosensitive recording according to claim 1, wherein a magnetic recording layer, a thermosensitive recording layer, and a protective layer are laminated in this order on the other surface of the base material, and the thermosensitive recording layer contains metal particles. Medium. 3. The magnetic thermosensitive recording medium according to claim 1, wherein a thermosensitive recording layer and a protective layer are laminated in this order on the other surface of the base material. 4. The magnetic thermosensitive recording medium according to claim 1, wherein the thermosensitive recording layer is subjected to calendar press processing. 5. Claims 1 to 4, wherein the protective layer is formed by applying and curing ultraviolet curable ink.
The magnetic thermosensitive recording medium described in .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2333582A JPH04201399A (en) | 1990-11-30 | 1990-11-30 | Magnetic thermal recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2333582A JPH04201399A (en) | 1990-11-30 | 1990-11-30 | Magnetic thermal recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04201399A true JPH04201399A (en) | 1992-07-22 |
Family
ID=18267659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2333582A Pending JPH04201399A (en) | 1990-11-30 | 1990-11-30 | Magnetic thermal recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04201399A (en) |
-
1990
- 1990-11-30 JP JP2333582A patent/JPH04201399A/en active Pending
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