JPS6233324A - Heat sensitive magnetic recording medium - Google Patents

Heat sensitive magnetic recording medium

Info

Publication number
JPS6233324A
JPS6233324A JP17176785A JP17176785A JPS6233324A JP S6233324 A JPS6233324 A JP S6233324A JP 17176785 A JP17176785 A JP 17176785A JP 17176785 A JP17176785 A JP 17176785A JP S6233324 A JPS6233324 A JP S6233324A
Authority
JP
Japan
Prior art keywords
layer
coercive force
magnetic
signal
recording medium
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
Application number
JP17176785A
Other languages
Japanese (ja)
Inventor
Jiro Suzuki
次郎 鈴木
Masayasu Suzuki
雅康 鈴木
Kazuo Ishigaki
石垣 和男
Tadashi Kiyohara
清原 紀
Takeshi Suzuki
武 鈴木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tomoegawa Co Ltd
Original Assignee
Tomoegawa Paper Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tomoegawa Paper Co Ltd filed Critical Tomoegawa Paper Co Ltd
Priority to JP17176785A priority Critical patent/JPS6233324A/en
Publication of JPS6233324A publication Critical patent/JPS6233324A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent the read of a signal and to prevent forgery by providing two layers of high coercive force and low coercive force on one surface of a base, providing a leuco dye heat sensitive color forming layer, barrier layer and protective layer on the other surface and incorporating zinc oxide and/or UV absorbent into one layer thereof. CONSTITUTION:A normal signal is recorded to the high coercive force layer of a magnetic recording medium constituted by providing a high coercive force layer 12 on one side of the base 11 consisting of a nonmagnetic sheet and laminating a low coercive force magnetic layer 13 thereon and a dummy signal is recorded to the low coercive force layer. The leuco dye heat sensitive color forming layer 15, barrier layer 16 and protective layer 17 are successively provided on another surface of the base and the zinc oxide and/or UV absorbent is incorporated into at lest one layer among these three layers. Then the normal signal of the high coercive force layer and the dummy signal of the low coercive force layer are superposed and it is to possible to detect which is the normal signal if the record of the magnetic medium is reproduced. The reproduction of the normal record by a transfer method and thermal transfer method is thus made difficult.

Description

【発明の詳細な説明】 〈産業上の利用分野〉 本発明は乗車券購入用あるいは公衆電話用等の金券、バ
ス共通回数券、定期券その他に使用される感熱磁気記録
媒体に関するものであり、とくに所定の操作を力IIえ
なければ記録された所定の信号を読みとることのできな
い偽造防止にすぐれた感熱磁気記録媒体に関するもので
ある。
[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a heat-sensitive magnetic recording medium used for ticket purchases, public phone tickets, etc., bus coupons, commuter passes, etc. In particular, it relates to a thermosensitive magnetic recording medium that is highly resistant to counterfeiting and in which a recorded signal cannot be read unless a specific operation is performed.

〈従来の技術〉 近年、金券、磁気回数券、道路通行券、定期券等におい
て磁気カード類の普及には目ざましいものがある。この
場合、磁気記録層を施した支持体のもう一方の面には顧
客がカードを使用する毎に変動する残金表示とか、ある
いはカードの有効期間、発行日等を可視情報として記録
する必要がある。このような記録をおこなう手段として
は、単に加熱するだけで鮮明な画像を得られる感熱記録
が磁気カードの裏面を構成する記録層として大いに着目
されている。
<Prior Art> In recent years, magnetic cards have become rapidly popular in the form of cash coupons, magnetic coupon tickets, road passes, commuter passes, and the like. In this case, it is necessary to record visible information on the other side of the support with a magnetic recording layer, such as a balance display that changes each time a customer uses the card, or the card's validity period, date of issue, etc. . As a means for performing such recording, thermal recording, which can obtain clear images simply by heating, has attracted much attention as a recording layer constituting the back surface of a magnetic card.

このような感熱磁気記録媒体の利用の拡大にともない磁
気媒体に記録した信号を市販の再生装置を使用して容易
に読みとることができ、又書き換えが出来るようになっ
たため、従来の磁気記録媒体では偽造を有効に防止し得
ない。
With the expansion of the use of thermosensitive magnetic recording media, it has become possible to easily read and rewrite signals recorded on magnetic media using commercially available playback devices, making it possible for conventional magnetic recording media to It is not possible to effectively prevent counterfeiting.

−力感熱磁気記録媒体に施される感熱記録層は、通常の
ファクシミリ用と比べて、その用途から明らかなとおり
、顧客のカードに対する取扱い性、使用頻度等において
きわめて過酷な実用特性を要求されている。従って、従
来技術にあるロイコ染料系の感熱材料を、そのまま本発
明のごとき過酷な使用条件にさらされる磁気カードの記
録に適用すると実用特性、とくに耐光性において重大な
支障を生じ、実用上大きな問題をかかえるものであった
-As is clear from its use, the heat-sensitive recording layer applied to force-sensitive thermomagnetic recording media is required to have extremely harsh practical characteristics in terms of ease of handling and frequency of use for customers' cards, compared to those for ordinary facsimile machines. There is. Therefore, if the leuco dye-based heat-sensitive material in the prior art is applied as it is to the recording of magnetic cards exposed to harsh usage conditions as in the present invention, there will be serious problems in practical properties, especially light resistance, and this will be a big practical problem. It was something that held a lot of things.

〈発明が解決しようとする問題点〉 本発明は上記の事情に鑑みてなされたものであり、磁気
信号の偽造防止に有効で、かつ感熱記録層に要求される
きびしい耐光性を改良した感熱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 has been made in view of the above circumstances, and provides a heat-sensitive magnetic material that is effective in preventing forgery of magnetic signals and that improves the severe light resistance required for heat-sensitive recording layers. It provides a recording medium.

く問題点を解決するための手段〉 本発明はポリエステルフィルム等の非磁性シートからな
る支持体の一方の面に高抗磁力磁気層を設け、その上に
低抗磁力磁気層を積層した磁気記録媒体の高抗磁力層に
正規の信号を記録し、低抗磁力層にダミーの信号を記録
することにより前述の・目的は達成される。この場合の
高抗磁力磁気層は、抗磁力1500〜5000エルステ
ッドのバリウムフェライト、ストロンチウムフェライト
が使用され、又、抵抗磁力層には酸化鉄磁性粉のごとく
200〜1000工ルステツド程度のものが本発明に好
適に使用され、これらはポリエステル樹脂、塩化ビニル
樹脂等の結着剤とともに支持体上に塗布、乾燥され2重
の磁気層が形成される。
Means for Solving the Problems> The present invention provides a magnetic recording system in which a high coercive force magnetic layer is provided on one side of a support made of a nonmagnetic sheet such as a polyester film, and a low coercive force magnetic layer is laminated thereon. The aforementioned objective is achieved by recording a regular signal in the high coercive force layer of the medium and recording a dummy signal in the low coercive force layer. In this case, the high coercive force magnetic layer is made of barium ferrite or strontium ferrite with a coercive force of 1,500 to 5,000 oersteds, and the resistive magnetic layer is made of iron oxide magnetic powder, which has a coercive force of about 200 to 1,000 oersteds. These are preferably used for coating on a support together with a binder such as polyester resin or vinyl chloride resin, and then dried to form a double magnetic layer.

又、該2重磁気層の上に必要に応じて白色系の保護層を
形成してもよい。
Further, a white protective layer may be formed on the dual magnetic layer, if necessary.

次に添付図面に基づいて本発明の詳細な説明する。第1
図は本発明でいう感熱磁気記録媒体の一実施例を示す断
面図であり、支持体11、高抗磁力層12、低抗磁力層
13、保護印刷層14、ロイコ染料系感熱発色層15、
バリヤー層16、保護層17から構成される。
Next, the present invention will be explained in detail based on the accompanying drawings. 1st
The figure is a sectional view showing an embodiment of the thermosensitive magnetic recording medium according to the present invention, which includes a support 11, a high coercive force layer 12, a low coercive force layer 13, a protective printing layer 14, a leuco dye-based thermosensitive coloring layer 15,
It is composed of a barrier layer 16 and a protective layer 17.

該感熱磁気記録媒体を使用して本発明の磁気記録を実施
するには、まず、高抗磁力層を磁化させるに十分な記録
電流を磁気ヘッドに流し、高抗磁力層を磁化させる。次
いで低抗磁力層にダミー信号を記録する。この時の記録
電流は感熱磁気記録媒体の上層の低抗磁力層を磁化させ
るのには十分な電流であるが下層の高抗磁力層を磁化さ
せるには不十分であるよう設定する。
To carry out the magnetic recording of the present invention using the thermosensitive magnetic recording medium, first, a recording current sufficient to magnetize the high coercive force layer is passed through the magnetic head to magnetize the high coercive force layer. Next, a dummy signal is recorded on the low coercive force layer. The recording current at this time is set to be sufficient to magnetize the upper low coercive force layer of the thermosensitive magnetic recording medium, but insufficient to magnetize the lower high coercive force layer.

なお、信号の入力は、先に低抗磁力層にダミー信号を記
録し、次いで高抗磁力層に正規の信号を記録してもよい
。この場合の高抗磁力層と抵抗磁力層の記録電流と再生
出力との定性的関係を第2図に示す。
Note that for signal input, a dummy signal may be first recorded in the low coercive force layer, and then a regular signal may be recorded in the high coercive force layer. FIG. 2 shows the qualitative relationship between the recording current and reproduction output of the high coercive force layer and the resistive magnetic layer in this case.

このように記録された磁気媒体の記録を再生させると、
高抗磁力層の正規の記録の信号と低抗磁力層のダミーの
信号とが重畳した信号として感知され、どれが正規の信
号か感知できない。従って転写法、熱転写法によって、
正規の記録を複製することが困難である。
When reproducing the recording on a magnetic medium recorded in this way,
The normal recorded signal in the high coercive force layer and the dummy signal in the low coercive force layer are detected as a superimposed signal, and it is impossible to detect which signal is the normal signal. Therefore, by transfer method, thermal transfer method,
Difficult to reproduce authentic records.

一方、支持体のもう一方の面にはロイコ染料系感熱発色
層、バリヤー層および保護層を順次設け、これら三層の
うちの少な(とも一層に酸化亜鉛および/又は紫外線吸
収剤を含有せしめる。
On the other hand, a leuco dye-based heat-sensitive coloring layer, a barrier layer and a protective layer are sequentially provided on the other side of the support, and one or more of these three layers contains zinc oxide and/or an ultraviolet absorber.

この場合における紫外線吸収剤は、例えば2.4−ジヒ
ドロキシベンゾフェノン、2−ヒドロキシ−4−メトキ
シベンゾフェノン、2−ヒドロキシ−4−n−オクトキ
シベンゾフェノン、4−ドデシルオキシ−2−ヒドロキ
シ−4−メトキシベンゾフェノン、2−ヒドロキシ−3
,6−ジクロル−4−エトキシベンゾフェノン、2−ヒ
ドロキシ−4−(ヒドロキシ−3−メチルアクリルオキ
シ)プロポキシベンゾフェノンなどのベンゾフェノン系
紫外線吸収剤、2−(2’−ヒドロキシ−3°−ターシ
ャリ−ブチル−5゛−メチルフェニル)ベンゾトリアゾ
ール、2−(2゛−ヒドロキシ−4°−オクトキシ)ベ
ンゾトリアゾール、2− (2’−ヒドロキシ−3’、
5’−ジターシャリ−ブチルフェニル)5−クロロベン
ゾトリアゾール、2−(2’−ヒドロキシ−5−エトキ
シフェニル)ベンゾトリアゾールなどのベンゾトリアゾ
ール系紫外線吸収剤、フェニルサリシレート、p−オク
チルフェニルサリシし一ト、p−ターシャリープチルフ
ェニルサリシレート、カルボキシフェニルサリシレート
、メチルフェニルサリシレート、ドデシルフェニルザリ
シレートなどのサリチル酸フェニルエステル系紫外線吸
収剤、あるいはp−メトキシベンジリデンマロン酸ジメ
チルエステル、2−エチルへキシル−2−シアノ−3,
3−ジフェニルアクリレート、エチル−2−シアノ−3
,3−ジフェニルアクリレート、3.5−ジターシャリ
−ブチル−p−ヒドロキシ安息香酸、紫外線により転位
してベンゾフェノンとなるレゾルシノールモノベンゾエ
ート、2’、4’−ジターシャリ−ブチルフェニル−3
,5ジターシャリ−ブチル−4−ヒドロキシベンゾエー
ト、等の溶剤分散タイプのほか、更に水溶性紫外線吸収
剤として、 2−ヒドロキシ−4−メトオキシベンゾフェノン−5−
スルホン酸 2−ヒドロキシ−4−メトオキシベンゾフェノン−5−
スルホン酸カリウム 2−ヒドロキシ−4−メトオキシベンゾフェノン−5−
スルホン酸ナトリウム 2.2−ジヒドロキシ−4,4′−ジフトオキシベンゾ
フェノン−5−スルホン酸ナトリウム 2.4−ジヒドロキシベンゾフェノン−5−スルホン酸
す]・リウム 2.2゛−ジヒドロキシ−4,4゛−ジメトオキシベン
ゾフェノン−5,5゛−ジスルホン酸ナトリウム2.4
−ジヒドロキシベンゾフェノン−5′−スルホン酸ソー
ダ のごとき水溶性ベンゾフェノン化合物やルチン、2−フ
ェニル−ベンズイミダゾール−5−スルホン酸アルカリ
金属塩、又はp−シンナモイルアミノベンゼンスルホン
酸アルカリ金属塩等が本発明に好適に使用される。
In this case, the ultraviolet absorber is, for example, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 4-dodecyloxy-2-hydroxy-4-methoxybenzophenone. , 2-hydroxy-3
, 6-dichloro-4-ethoxybenzophenone, benzophenone ultraviolet absorbers such as 2-hydroxy-4-(hydroxy-3-methylacryloxy)propoxybenzophenone, 2-(2'-hydroxy-3°-tert-butyl- 5′-methylphenyl)benzotriazole, 2-(2′-hydroxy-4°-octoxy)benzotriazole, 2-(2′-hydroxy-3′,
Benzotriazole ultraviolet absorbers such as 5'-ditert-butylphenyl)5-chlorobenzotriazole, 2-(2'-hydroxy-5-ethoxyphenyl)benzotriazole, phenyl salicylate, p-octylphenyl salicylate , p-tert-butylphenyl salicylate, carboxyphenyl salicylate, methyl phenyl salicylate, dodecylphenyl salicylate, and other salicylic acid phenyl ester UV absorbers, or p-methoxybenzylidene malonic acid dimethyl ester, 2-ethylhexyl-2- Cyano-3,
3-diphenylacrylate, ethyl-2-cyano-3
, 3-diphenylacrylate, 3,5-ditertiary-butyl-p-hydroxybenzoic acid, resorcinol monobenzoate which rearranges to benzophenone when exposed to ultraviolet light, 2',4'-ditertiary-butylphenyl-3
, 5-ditert-butyl-4-hydroxybenzoate, etc., as well as water-soluble ultraviolet absorbers such as 2-hydroxy-4-methoxybenzophenone-5-
2-hydroxy-4-methoxybenzophenone-5-sulfonic acid
Potassium sulfonate 2-hydroxy-4-methoxybenzophenone-5-
Sodium sulfonate 2.2-dihydroxy-4,4'-diphthoxybenzophenone-5-sodium 2.4-dihydroxybenzophenone-5-sulfonic acid 2.2'-dihydroxy-4,4'-Dimethoxybenzophenone-5,5'-sodium disulfonate 2.4
-Dihydroxybenzophenone-5'-Water-soluble benzophenone compounds such as sodium sulfonate, rutin, alkali metal salts of 2-phenyl-benzimidazole-5-sulfonic acid, or alkali metal salts of p-cinnamoylaminobenzenesulfonic acid are used in the present invention. It is suitably used for.

次に酸化亜鉛および/又は紫外線吸収剤の配合の対象と
なるロイコ染料系感熱発色層、バリヤー層および保護層
の材料について説明する。ロイコ染料系感熱発色層で使
用される通常無色又はやや淡色のロイコ体としては、ト
リフェニルメタン系、フルオラン系、フェノチアジン系
、オーラミン系、スピロピラン系染料のロイコ体があり
、これには例えば、 3.3−ビス(p−ジメチルアミノフェニル)−6−シ
メチルアミノフタリド、 3.3−ビス(p−ジメチルアミノフェニル)フタリド
、3.3−ビス(、−ジメチルアミノフェニル)−6−
ジメチルアミノフェニル、 3.3−ビス(p−ジメチルアミノフェニル)−6−ク
ロロフタリド、 3−(N叩−トリル−N−エチルアミノ)−6−メチル
−7−(N−フェニルアミノ)フルオラン、 2−(3,6−ビス(ジエチルアミン)−9−(o−ク
ロロアニリノ)キサンチル〕、 安息香酸ラクタム、 などが挙げられる。
Next, materials for the leuco dye-based heat-sensitive coloring layer, barrier layer and protective layer to which zinc oxide and/or ultraviolet absorber are added will be explained. The normally colorless or slightly light-colored leuco bodies used in the leuco dye-based thermosensitive coloring layer include the leuco bodies of triphenylmethane, fluoran, phenothiazine, auramine, and spiropyran dyes, and these include, for example, 3 .3-bis(p-dimethylaminophenyl)-6-dimethylaminophthalide, 3.3-bis(p-dimethylaminophenyl)phthalide, 3.3-bis(,-dimethylaminophenyl)-6-
Dimethylaminophenyl, 3.3-bis(p-dimethylaminophenyl)-6-chlorophthalide, 3-(N-tolyl-N-ethylamino)-6-methyl-7-(N-phenylamino)fluoran, 2 -(3,6-bis(diethylamine)-9-(o-chloroanilino)xanthyl], benzoic acid lactam, and the like.

又、前記ロイコ体と熱時発色反応を起こし、該ロイコ体
を発色せしめる酸性物質としては例えばα−ナフトール
、β−ナフトール、4−t−ブチルフェノール、4−t
−オクチルフェノール、4−フェニルフェノール、2.
2−ビス(p−ヒドロキシフェニル)プロパン(別名:
ビスフェノールA)、2.2−(p−ヒドロキシフェニ
ル)ブタン、4.4’−シクロへキシリダンジフェノー
ル、2.2−ビス(2,5−ジブロム−4−ヒドロキシ
フェニル)プロパン、4.4−イソプロピリデンビス(
2−1−ブチルフェノール)、2.2’−メチレンビス
(4−クロロフェノール)、安息香酸、サリチル酸、酒
石酸、没食子酸等の誘導体、ビス(4−ヒドロキシフェ
ニル)酢酸エステルの誘導体等が挙げられる。
In addition, examples of acidic substances that cause a coloring reaction with the leuco body and cause the leuco body to develop color include, for example, α-naphthol, β-naphthol, 4-t-butylphenol, 4-t
-octylphenol, 4-phenylphenol, 2.
2-bis(p-hydroxyphenyl)propane (also known as:
Bisphenol A), 2.2-(p-hydroxyphenyl)butane, 4.4'-cyclohexylidandiphenol, 2.2-bis(2,5-dibromo-4-hydroxyphenyl)propane, 4.4- Isopropylidene bis(
Examples include derivatives of 2-1-butylphenol), 2,2'-methylenebis(4-chlorophenol), benzoic acid, salicylic acid, tartaric acid, gallic acid, and bis(4-hydroxyphenyl)acetic acid ester.

以上の発色成分を従来の如(結合剤とともに感熱記録層
塗液と成し、該液を磁気記録層を一方の面に有する支持
体のもう一方の面に塗布、乾燥し感熱発色層を設ける。
The above-mentioned color-forming components are combined with a binder to form a heat-sensitive recording layer coating liquid, and the liquid is applied to the other side of a support having a magnetic recording layer on one side, and dried to form a heat-sensitive color-forming layer. .

結合剤としては例えば以下のようなものが挙げられる。Examples of the binder include the following.

ポリビニルアルコール、メトキシセルロース、ヒドロキ
シエチルセルロース、カルボキシメチルセルロース、ポ
リビニルピロリドン、ポリアクリルアミド、ポリアクリ
ル酸、デンプン、ゼラチンなどのような水溶性のもの、
あるいはポリスチレン、塩化ビニル−酢酸ビニル共重合
体、ポリブチルメタアクリレートなどのような水性エマ
ルジョン。
Water-soluble ones such as polyvinyl alcohol, methoxycellulose, hydroxyethylcellulose, carboxymethylcellulose, polyvinylpyrrolidone, polyacrylamide, polyacrylic acid, starch, gelatin, etc.
Or an aqueous emulsion such as polystyrene, vinyl chloride-vinyl acetate copolymer, polybutyl methacrylate, etc.

なお、前記感熱発色層中に通常用いられている填料、潤
滑剤、増感剤等の添加剤を用いてもよい。
Incidentally, additives such as fillers, lubricants, sensitizers, etc. that are commonly used in the heat-sensitive coloring layer may be used.

バリヤー層は溶剤系塗料からなる保護層と感熱発色層と
を隔離するためのものでその材料としては一般に知られ
ている水溶性樹脂が使用される〇又、保護層は感熱記録
層の耐水性、耐可塑剤性、耐薬品性等実用特性を確保す
るために施すものであり、例えばポリウレタン樹脂、ア
クリル系樹脂、エポキシ樹脂、弗素系樹脂等溶剤タイプ
の各種ポリマーが適用可能である。
The barrier layer is used to separate the protective layer made of solvent-based paint from the heat-sensitive coloring layer, and its material is generally known water-soluble resin.Also, the protective layer protects the water resistance of the heat-sensitive recording layer. This is applied to ensure practical properties such as plasticizer resistance and chemical resistance. For example, various solvent-type polymers such as polyurethane resin, acrylic resin, epoxy resin, and fluorine resin can be applied.

〈実施例〉 次に本発明を実施例により詳細に説明する。<Example> Next, the present invention will be explained in detail with reference to examples.

実施例1 厚さ188μmを有する酸化チタン練込みポリエステル
フィルムからなる支持体の上に下記に示す配合1からな
る高抗磁力の磁気塗料を塗布厚13μmになるよう塗工
し、その上に配合2からなる低抗磁力の磁気塗料を塗布
厚10μmからなるよう塗工して積層し、さらにその上
に白色のグラビアインキでグラビア塗工し表面に所定の
パターンを印刷した保護印刷層を設けた。
Example 1 A magnetic paint with high coercive force consisting of formulation 1 shown below was coated to a coating thickness of 13 µm on a support made of a polyester film kneaded with titanium oxide having a thickness of 188 µm, and then formulation 2 was applied on top of it to a coating thickness of 13 µm. A low coercive force magnetic paint consisting of the following was applied and laminated to a coating thickness of 10 μm, and then a protective printing layer was provided by gravure coating with white gravure ink and printing a predetermined pattern on the surface.

配合1 「メヂルエチルゲトン       330重量部配合
2 一方、支持体のもう一方の面にロイコ染料系発色層、バ
リヤー層、保護層を下記の配合処方に従って順次塗工積
層して本発明の感熱磁気記録媒体を作製した。
Formulation 1: 330 parts by weight of methyl ethyl getone Formulation 2 On the other hand, on the other side of the support, a leuco dye-based coloring layer, a barrier layer, and a protective layer were sequentially coated and laminated according to the following formulation to form the heat-sensitive magnet of the present invention. A recording medium was produced.

Cロイコ染料系感熱発色層〕 下記処方からなるA液、BKlおよびC液をボールミル
にて24時間分散して塗液を調製した。
Leuco Dye-Based Thermosensitive Coloring Layer] A coating solution was prepared by dispersing solutions A, BKl, and C having the following formulations in a ball mill for 24 hours.

A液 B液 「ビス(4−ヒドロキシフェニル)      15部
i 上記のA液10部、B液33.3部、C液49部、紫外
線吸収剤2.2°−ジヒドロキシ−4,4′−ジフトオ
キシベンゾフェノン−6−スルホン酸ナトリウム1部、
ジメチルジチオカルバミン酸ナトリウム1部、結着剤と
して20%ジイソブチレン−無水マレイン酸アンモニウ
ム塩水溶液(オロタン165、ロームアンドハース製)
15部、水46部を混合して感熱記録用塗料を得た。こ
の塗料を前記磁気記録層を有する支持体のもう一方の面
に塗布、乾燥して塗布ff16g/nfの感熱層を設け
た。
Solution A Solution B "bis(4-hydroxyphenyl) 15 parts i 10 parts of the above Solution A, 33.3 parts of Solution B, 49 parts of Solution C, 2.2°-dihydroxy-4,4'-di 1 part sodium phthoxybenzophenone-6-sulfonate,
1 part of sodium dimethyldithiocarbamate, 20% diisobutylene-maleic anhydride ammonium salt aqueous solution as a binder (Olotane 165, manufactured by Rohm and Haas)
A heat-sensitive recording paint was obtained by mixing 15 parts and 46 parts of water. This coating material was applied to the other side of the support having the magnetic recording layer and dried to form a heat-sensitive layer having a coating f/ff of 16 g/nf.

〔バリヤー層〕[Barrier layer]

下記り液からなる塗液を該感熱発色層上に塗布量3 g
lraとなるよう塗布してバリヤー層を形成した。
A coating amount of 3 g of the following liquid was applied onto the heat-sensitive coloring layer.
A barrier layer was formed by applying the coating to give lra.

D液 〔保護層〕 さらに下記配合からなるE液を該バリヤー層上に塗布、
乾燥して塗布量1g/−の保護層を形成して本発明の感
熱磁気記録媒体を得た。
Liquid D [protective layer] Furthermore, apply liquid E consisting of the following formulation on the barrier layer,
A protective layer having a coating weight of 1 g/- was formed by drying to obtain a thermosensitive magnetic recording medium of the present invention.

E液 この感熱磁気記録媒体にギャップ30μt11% トラ
ック巾4mmの磁気ヘッドにより記録電流600a+A
でFM方式記録密度2108PIで正規信号を記録した
。更に上記ヘッドにより100mAで同じ(FM方式記
録密度2108PIでダミー信号を記録した。この場合
において得られた磁気カードの記録電流と再生出力との
関係をみたところ、再生出力ピークが二つ確認された。
E liquid This thermosensitive magnetic recording medium has a recording current of 600a+A using a magnetic head with a gap of 30μt11% and a track width of 4mm.
A regular signal was recorded at an FM recording density of 2108 PI. Furthermore, a dummy signal was recorded using the above head at 100 mA at the same (FM method recording density: 2108 PI).When we looked at the relationship between the recording current of the magnetic card obtained in this case and the playback output, two playback output peaks were confirmed. .

この記録済みの磁気媒体を通常の読取装置で再生した結
果、正規信号はダミー信号に重畳され正規信号を読取る
ことが出来なかった。この磁気カードを本発明による読
取装置で読んだところ、第1の磁気ヘッドでは正規信号
とダミー信号の重畳した記録信号が読み出され、第3の
磁気ヘッドでは正規信号を読取ることができた。
When this recorded magnetic medium was reproduced using a normal reading device, the normal signal was superimposed on the dummy signal and the normal signal could not be read. When this magnetic card was read by the reading device according to the present invention, the first magnetic head read a recorded signal in which a regular signal and a dummy signal were superimposed, and the third magnetic head was able to read a regular signal.

一方、本発明の感熱磁気記録媒体をサンシャインスパー
ロングライフフェザ−メーター(スガ試験機製)に設置
して、ドライの状態で60時間露光し、発色部(120
℃の熱板による)の光退色による濃度変化をマクベス濃
度計で測定した。その結果発色部の濃度残存率、すなわ
ち は95%以上であってきわめてすぐれた耐光性が確認さ
れた。又、この感熱磁気記録媒体を感熱記録機構を有す
る金券用券売機に適用し、所定の磁気情報の書き込み、
読み取りと同時に残金表示額を感熱記録面に施したとこ
ろ実装上、全く支障のないことが確認された。
On the other hand, the thermosensitive magnetic recording medium of the present invention was installed in a Sunshine Super Long Life Feather Meter (manufactured by Suga Test Instruments), and exposed in a dry state for 60 hours.
The density change due to photobleaching (by heating plate at ℃) was measured using a Macbeth densitometer. As a result, it was confirmed that the residual density of the colored part was 95% or more, and that it had extremely excellent light resistance. In addition, this heat-sensitive magnetic recording medium is applied to a ticket vending machine having a heat-sensitive recording mechanism to write predetermined magnetic information,
When the balance was displayed on the thermal recording surface at the same time as the reading, it was confirmed that there were no problems with implementation.

実施例2 厚さ188μmを有する酸化チタン練込みポリエステル
フィルムからなる支持体の上に下記に示す配合1からな
る高抗磁力の磁気塗料を塗布厚15μmになるよう塗工
し、その上に配合2からなる低抗磁力の磁気塗料を塗布
厚10pIIlになるよう塗工して積層し2重の磁気層
を設けた以外は全て実施例1と同様にして本発明の感熱
磁気カードを作製した。
Example 2 A magnetic paint with high coercive force consisting of formulation 1 shown below was coated to a coating thickness of 15 µm on a support made of a polyester film kneaded with titanium oxide having a thickness of 188 µm, and then formulation 2 was applied on top of it to a coating thickness of 15 µm. A heat-sensitive magnetic card of the present invention was prepared in the same manner as in Example 1, except that a low coercive force magnetic paint consisting of the following was applied to a coating thickness of 10 pIIl and laminated to form a double magnetic layer.

配合1 配合2 得られた感熱磁気記録媒体に対し、実施例1と同要領に
て磁気記録を施し、記録電流と再生出力との関係をみる
と、やはり再生出力が二つ観察された。
Formulation 1 Formulation 2 Magnetic recording was performed on the obtained thermosensitive magnetic recording medium in the same manner as in Example 1, and when looking at the relationship between recording current and reproduction output, two reproduction outputs were also observed.

この記録済みの磁気カードを通常の読取装置で再生した
結果、正規信号はダミー信号に重畳され読みとることが
できなかったが、本発明による読取装置により読とるこ
とができた。
When this recorded magnetic card was reproduced using a normal reading device, the regular signal was superimposed on the dummy signal and could not be read, but it could be read by the reading device according to the present invention.

〈発明の効果〉 本発明は上記の構成からなるので感熱磁気記録媒体に記
録された正規の磁気信号を容易に感知することが不可能
となり、熱転写や接触転写法による偽造が防止できる。
<Effects of the Invention> Since the present invention has the above-described configuration, it becomes impossible to easily detect a regular magnetic signal recorded on a thermosensitive magnetic recording medium, and counterfeiting by thermal transfer or contact transfer methods can be prevented.

又、感熱記録層は金券、定期券等の用途において顧客の
過酷の使用条件下にお・いて使用されても耐光性等実用
特性においてきわめてすぐれた耐用性が確認された。
In addition, it was confirmed that the heat-sensitive recording layer has excellent durability in terms of practical properties such as light resistance even when used under harsh usage conditions by customers in applications such as cash coupons and commuter passes.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の感熱磁気記録媒体の拡大断面図、第2
図は本発明でいう高抗磁力層と抵抗磁力層の記録電流と
再生出力との定性的関係を示す図である。 11・・・・・・支持体     15・・・・・・感
熱発色層12・・・・・・高抗磁力層   16・・・
・・・バリヤー層I3・・・・・・低抗磁力層   I
7・・印・保護層14・・・・・・保護印刷層
FIG. 1 is an enlarged sectional view of the thermosensitive magnetic recording medium of the present invention, and FIG.
The figure is a diagram showing the qualitative relationship between the recording current and reproduction output of the high coercive force layer and the resistive magnetic layer according to the present invention. 11...Support 15...Thermosensitive coloring layer 12...High coercive force layer 16...
...Barrier layer I3...Low coercive force layer I
7... Mark/Protective layer 14... Protective printing layer

Claims (1)

【特許請求の範囲】 1 支持体の一方の面に高抗磁力の磁気層を設け、その
上に直接低抗磁力の磁気層を順次積層して2層の磁気層
を設け、同支持体のもう一方の面に、ロイコ染料系感熱
発色層、バリヤー層および保護層を順次設けてなる感熱
記録用積層において、該感熱発色層、バリヤー層および
保護層のうちで少なくとも一層に酸化亜鉛および/又は
紫外線吸収剤を含有せしめたことを特徴とする感熱磁気
記録媒体。 2 高抗磁力の磁気層の抗磁力が1500〜5000エ
ルステッドである特許請求の範囲第1項記載の感熱磁気
記録媒体。
[Claims] 1. A magnetic layer with a high coercive force is provided on one side of a support, and a magnetic layer with a low coercive force is directly laminated on the magnetic layer in sequence to form two magnetic layers, In a heat-sensitive recording laminate in which a leuco dye-based heat-sensitive coloring layer, a barrier layer and a protective layer are sequentially provided on the other side, at least one of the heat-sensitive coloring layer, barrier layer and protective layer contains zinc oxide and/or A thermosensitive magnetic recording medium characterized by containing an ultraviolet absorber. 2. The thermosensitive magnetic recording medium according to claim 1, wherein the coercive force of the high coercive force magnetic layer is 1,500 to 5,000 Oe.
JP17176785A 1985-08-06 1985-08-06 Heat sensitive magnetic recording medium Pending JPS6233324A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17176785A JPS6233324A (en) 1985-08-06 1985-08-06 Heat sensitive magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17176785A JPS6233324A (en) 1985-08-06 1985-08-06 Heat sensitive magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS6233324A true JPS6233324A (en) 1987-02-13

Family

ID=15929298

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17176785A Pending JPS6233324A (en) 1985-08-06 1985-08-06 Heat sensitive magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS6233324A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5085306A (en) * 1973-10-31 1975-07-09
JPS57123090A (en) * 1981-01-23 1982-07-31 Ricoh Co Ltd Heat-sensitive recording type magnetic roll paper

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5085306A (en) * 1973-10-31 1975-07-09
JPS57123090A (en) * 1981-01-23 1982-07-31 Ricoh Co Ltd Heat-sensitive recording type magnetic roll paper

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