JPH04201397A - Magnetic thermal recording medium - Google Patents
Magnetic thermal recording mediumInfo
- Publication number
- JPH04201397A JPH04201397A JP2333580A JP33358090A JPH04201397A JP H04201397 A JPH04201397 A JP H04201397A JP 2333580 A JP2333580 A JP 2333580A JP 33358090 A JP33358090 A JP 33358090A JP H04201397 A JPH04201397 A JP H04201397A
- Authority
- JP
- Japan
- Prior art keywords
- recording layer
- magnetic
- thermal recording
- heat
- 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
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 229920000881 Modified starch Polymers 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
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- 229920000147 Styrene maleic anhydride Polymers 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 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
- YXVFYQXJAXKLAK-UHFFFAOYSA-N biphenyl-4-ol Chemical compound C1=CC(O)=CC=C1C1=CC=CC=C1 YXVFYQXJAXKLAK-UHFFFAOYSA-N 0.000 description 1
- 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
- 235000021240 caseins Nutrition 0.000 description 1
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- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
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- 239000008273 gelatin Substances 0.000 description 1
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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- IBKQQKPQRYUGBJ-UHFFFAOYSA-N methyl gallate Natural products CC(=O)C1=CC(O)=C(O)C(O)=C1 IBKQQKPQRYUGBJ-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)
- Paints Or Removers (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−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 [Field of Industrial Application] The present invention relates to a magnetic thermosensitive recording medium, and particularly to a magnetic thermosensitive recording medium whose thermosensitive 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
。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ラドに
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 a base material, and the ticket type, usage status, etc. are recorded on this magnetic recording layer. However, there was a demand for a prepaid card that would allow users to visually check usage status. For this reason, it has a magnetic recording layer and a heat-sensitive recording layer, and the magnetic recording layer can record with a magnetic head, and the heat-sensitive recording layer can record various information and visible information such as usage status with a thermal helad. A magnetic thermosensitive recording medium has been developed. 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
て細線かかすれたり、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 problems such as thin lines becoming blurred, contours of figures becoming less sharp, and recording resolution decreasing. 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、磁気記録層が良好に隠蔽されて感熱記録層上の記録
の認識性が高いとともに、感熱記録層の解像度が高く印
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 it provides a magnetic recording layer that is well hidden and the recording on the heat-sensitive recording layer is highly recognizable, and the heat-sensitive recording layer has a high resolution and is 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、前記感熱記録層が二酸化チタンお
よび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 is made of titanium dioxide and metal. The structure was such that it contained particles.
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することにより磁気記録層が良
好に隠蔽され、さらに感熱記録層に含有される二酸化チ
タンが上記金属粒子間に存在することにより感熱記録層
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
印字適性か大幅に向上する。The heat-sensitive recording layer provided on the magnetic recording layer provided on one side of the base material contains metal particles, so that the magnetic recording layer is well hidden, and furthermore, the titanium dioxide contained in the heat-sensitive recording layer hides the metal particles. The presence of the heat-sensitive recording layer in between makes the surface of the heat-sensitive recording layer highly smooth, and even when recording is performed on the heat-sensitive recording layer with a thermal head through the protective layer, the distance between the thermal head and the heat-sensitive recording layer fluctuates. Printability is greatly improved without any problems.
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。第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 FIG. 1, a 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に二酸
化チタンおよび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。また、バインダーに比べて比重が大きい二酸化
チタンも感熱記録層４の下方に多く集まり、金属粒子間
あるいは金属粒子と後述する顕色剤、発色剤との間に存
在し、金属粒子による凹凸が感熱記録層４の表面に生じ
ることが防止される。したがって、感熱記録層４は平滑
度の高いものとなる。The present invention hides the magnetic recording layer 3 by containing titanium dioxide and metal particles in the heat-sensitive recording layer 4 provided on the magnetic recording layer 3, and also significantly improves the surface smoothness of the heat-sensitive recording layer 4. The biggest feature is that That is,
Since the metal particles contained in the heat-sensitive recording layer 4 have a higher specific gravity than the binder, they are located below the heat-sensitive recording layer 4 (the magnetic recording layer 3
The brown or black color of the magnetic powder in the magnetic recording layer 3 is hidden, and the recording (usually a black thermosensitive color) in the thermosensitive recording layer 4 becomes easier to recognize. In addition, titanium dioxide, which has a higher specific gravity than the binder, also gathers in large quantities below the heat-sensitive recording layer 4, and exists between metal particles or between metal particles and color developers and color formers, which will be described later. This is prevented from occurring on the surface of the recording layer 4. 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、二酸化チタンおよび金
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 made of a phenolic compound (color developer), a leuco dye (color former) that reacts with the phenolic compound under heating to form a color, and titanium dioxide and metal particles in a binder. It is formed by applying the contained heat-sensitive recording ink by a known coating method such as gravure coating or silk screen.
二酸化チタンは、平均粒子径１μｍ以下程度であり、１
０〜４０重量％の範囲で感熱記録層４に含有される。ま
た、金属粒子は一般に平板状であり、平均粒子径は６〜
１５μｍ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。Titanium dioxide has an average particle size of about 1 μm or less, and
It is contained in the heat-sensitive recording layer 4 in a range of 0 to 40% by weight. In addition, metal particles are generally tabular and have an average particle size of 6 to 6.
It has a diameter of about 15 μm and is contained in the heat-sensitive recording layer 4 in a range of 10 to 40% by weight.
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には二酸化チタンの他に、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。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. Also,
In addition to titanium dioxide, the heat-sensitive recording layer 4 contains calcined kaolin,
Talc, calcium carbonate, aluminum hydroxide, magnesium hydroxide, silica, diatomaceous earth, urea-formalin filler, cellulose filler, etc. may be contained in a range of 20 to 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−フエニチルフルオラン、３−ジエ
チルアミン−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-phenylfluoran, 3-diethylamine-7-(4-nitroanilino)fluoran, etc., and one of these Or two or more types 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、２．４．６−
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, 2.4.6-
Trihydroxybenzoic acid, p-octylphenol, p
-tert-butylphenol, p-phenylphenol, 1,1-bis(p-hydroxyphenyl)propane, etc., 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ができる。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, and the like 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７〜９μｍ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 7 to 9 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し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の範囲にあることが好ましい。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が小さく
なり、電磁変換特性における分離損失を低くすることが
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. Thereby, the space loss between the magnetic recording layer 3 and the magnetic head can be reduced, and the 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１図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か可能となる。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' also has a magnetic recording layer 3', a thermosensitive recording layer 4' and a protective layer on the other side of the base material 2 of the magnetic thermosensitive recording medium shown in FIG. The arrangement is such that it similarly comprises layer 5'. 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′には金属粒子あるいは二
酸化チタンおよび金属粒子が含有されていなくてもよい
。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. With such a configuration, thermal recording can be performed even on the back side of the magnetic thermosensitive recording medium, and the display area for visible information and the like is expanded. In this case, since no magnetic recording layer is present on the other surface of the base material 2, the heat-sensitive recording layer 4' does not need to contain metal particles or titanium dioxide and 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フートにより
磁気記録層（厚さ１４μｍ）を形成した。(Experiment example) Sample-1 A magnetic recording layer (14 μm thick) was applied using a gravure roll foot using a magnetic ink having the composition below on a 188 μm thick polyethylene terephthalate film (Lumirror E-22 manufactured by Toshiku Co., Ltd.) as a base material. was 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・ポリエステルレジ
ン 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二酸化チタンお
よび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８μ
ｍ）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−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 thermosensitive recording layer (thickness 8 μm
A protective layer (m) is formed on this heat-sensitive recording layer by gravure roll coating using a protective layer ink having the composition shown below.
A magnetic thermosensitive recording medium (sample-1) as shown in FIG.
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
レート樹脂 １０重量部・ルチル型二酸化チタン
２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樹脂 １０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・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）４０ｋｇ／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 polymethyl methacrylate resin 10 parts by weight rutile titanium dioxide
2 parts by weight, toluene 5
Parts by weight [Liquid B, 3 parts by weight of 0-phthalic acid, 10 parts by weight of polymethyl methacrylate resin, Aluminum paste 5ap2171 (manufactured by Showa Aluminum Powder)
2 parts by weight, 5 parts by weight toluene (Liquids A and 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 (press pressure (linear pressure) 40 kg/an
) A magnetic thermosensitive recording medium (Sample-2) was prepared in the same manner as Sample-1 except that the following steps were 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Ｉ７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 magnetic recording medium (3 μm in thickness) 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
上に二酸化チタンおよび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 heat-sensitive recording layer (thickness: 4 μm) was formed by gravure roll coating using a heat-sensitive recording ink with the following composition that does not contain titanium dioxide and metal particles, and finally Sample-1
A protective layer was formed in the same manner as described above to prepare a magnetic thermosensitive recording medium (comparative sample).
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・ブチルセロソルブ ２０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含有された二酸化チタ
ン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 ・Butyl cellosolve 20 parts by weight Composition of thermal recording ink [Liquid A] ・Fluoran-based leuco dye (TH-106 manufactured by Hodogaya Chemical Co., Ltd.)
) 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 (1 part A: 1 part B/toluene)
They were mixed at a ratio of 1:1 and stirred with a propeller mixer. ) Next, samples 1 to 3 prepared as described above and comparative samples were printed using a thermal 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 as follows:
All 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 the titanium dioxide contained 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、この感熱記録
層には二酸化チタンが含有されていることにより、金属
粒子間等に二酸化チタンが存在し、金属粒子による凹凸
が感熱記録層の表面に生じることが防止されて感熱記録
層表面の平滑性が良好なものとなり、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
印字適性が大幅に改良されるとともに、感熱記録層に含
有される二酸化チタンにより磁気記録層の隠蔽がより高
くなり、感熱記録層上の記録の認識性がさらに向上する
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 this heat-sensitive recording layer contains titanium dioxide, which exists between the metal particles, preventing unevenness caused by the metal particles from forming on the surface of the heat-sensitive recording layer, and improving the smoothness of the surface of the heat-sensitive recording layer. When recording on a heat-sensitive recording layer using a thermal head, the distance between the thermal head and the heat-sensitive recording layer does not change, improving resolution and greatly improving printing suitability. Titanium dioxide has the effect of further improving the concealment of the magnetic recording layer and further improving the recognizability of recording on the heat-sensitive recording layer.
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’ 、４’・・
・感熱記録層、５．５’ 、５’・・・保護層。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', 4'...
- Heat-sensitive recording layer, 5.5', 5'...protective layer.
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
二酸化チタンおよび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、前記感熱記録層が二酸化チ
タンおよび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 titanium dioxide and metal particles. A magnetic thermosensitive recording medium characterized by: 2. A magnetic recording layer, a heat-sensitive recording layer, and a protective layer are laminated in this order on the other surface of the base material, and the heat-sensitive recording layer contains titanium dioxide and metal particles. Magnetic thermosensitive recording 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 |
|---|---|---|---|
| JP2333580A JPH04201397A (en) | 1990-11-30 | 1990-11-30 | Magnetic thermal recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2333580A JPH04201397A (en) | 1990-11-30 | 1990-11-30 | Magnetic thermal recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04201397A true JPH04201397A (en) | 1992-07-22 |
Family
ID=18267636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2333580A Pending JPH04201397A (en) | 1990-11-30 | 1990-11-30 | Magnetic thermal recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04201397A (en) |
-
1990
- 1990-11-30 JP JP2333580A patent/JPH04201397A/en active Pending
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