JPH05231B2 - - Google Patents
Info
- Publication number
- JPH05231B2 JPH05231B2 JP58058893A JP5889383A JPH05231B2 JP H05231 B2 JPH05231 B2 JP H05231B2 JP 58058893 A JP58058893 A JP 58058893A JP 5889383 A JP5889383 A JP 5889383A JP H05231 B2 JPH05231 B2 JP H05231B2
- Authority
- JP
- Japan
- Prior art keywords
- heat
- sensitive recording
- recording material
- alkyl group
- color
- 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.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 25
- 239000000126 substance Substances 0.000 claims description 7
- 125000000217 alkyl group Chemical group 0.000 claims description 6
- 238000004040 coloring Methods 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 150000002431 hydrogen Chemical class 0.000 claims description 4
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 150000002367 halogens Chemical class 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 1
- 150000003585 thioureas Chemical class 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 10
- WOZVHXUHUFLZGK-UHFFFAOYSA-N dimethyl terephthalate Chemical compound COC(=O)C1=CC=C(C(=O)OC)C=C1 WOZVHXUHUFLZGK-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 239000000975 dye Substances 0.000 description 5
- DDMUCNBBNKTNCX-UHFFFAOYSA-N 1,3-bis(3-chlorophenyl)thiourea Chemical compound ClC1=CC=CC(NC(=S)NC=2C=C(Cl)C=CC=2)=C1 DDMUCNBBNKTNCX-UHFFFAOYSA-N 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229940037312 stearamide Drugs 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- ULNVBRUIKLYGDF-UHFFFAOYSA-N 1,3-bis(4-methylphenyl)thiourea Chemical compound C1=CC(C)=CC=C1NC(=S)NC1=CC=C(C)C=C1 ULNVBRUIKLYGDF-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- MOZDKDIOPSPTBH-UHFFFAOYSA-N Benzyl parahydroxybenzoate Chemical compound C1=CC(O)=CC=C1C(=O)OCC1=CC=CC=C1 MOZDKDIOPSPTBH-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000003951 lactams Chemical class 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
Description
〔技術分野〕
本発明は感熱記録材料に関し、更に詳しくは常
温において通常無色ないしやや淡色のロイコ染料
と顕色剤を主成分とする感熱発色層を支持体上に
設けた感熱記録材料に関する。
〔従来技術〕
感熱記録材料は一般に紙、合成紙、プラスチツ
クフイルム等の支持体上に熱発色性組成物を主成
分とする感熱発色層を設けたもので、熱ヘツド、
熱ペン、レーザー光等で加熱することにより発色
画像が得られる。この種の記録材料は他の記録材
料に比べて現像、定着等の煩雑な処理を施すこと
なく、比較的簡単な装置で短時間に記録が得られ
ること、騒音の発生及び環境汚染が少ないこと、
コストが安いことなどの利点により、図書、文書
などの複写に用いられる他、電子計算機、フアク
シミリ、券売機、ラベル、レコーダーなど多方面
に亘る記録材料として広く利用されている。この
ような感熱記録材料に用いられる熱発色性組成物
は一般に発色剤と、この発色剤を熱時発色せしめ
る顕色剤とからなり、発色剤としては例えばラク
トン、ラクタム又はスピロピラン環を有する無色
又は淡色のロイコ染料が、また顕色剤としては各
種の酸性物質、例えば有機酸やフエノール性物質
が用いられている。この発色剤と顕色剤とを組合
せた記録材料は特に得られる画像の色調が鮮明で
あり且つ地肌の白色度が高く、しかも画像（染料
画像）の耐候性が優れているという利点を有し、
広く利用されている。
しかし、近年、感熱記録方式が従来の他の記録
方式にとつて代り、需要が増大するにつれてこの
方式に用いられる感熱記録材料の品質向上に対す
る要求も高まつてきており、特に昨今各種印字装
置の高速化にともない感度が高く保存安定性に優
れた感熱記録材料に対する要望が強まつている。
かかる要望に応え、記録紙の高感度化を改良する
方法として、例えば、特開昭49−34842号公報、
特開昭52−106746号公報等に示されるような、熱
可融性物質の添加が知られているが、この場合、
ヘツドマツチング性や保存安定性の低下を招くと
いう問題がある。又、保存安定性を改良する方法
として、特開昭54−109454号公報、特公昭51−
43396号公報等に示されるような、特定のロイコ
染料及びフエノール性物質の混合が知られている
が、この方法は白色度の低下や耐熱保存時の地肌
発色等が起る等の問題点を有している。
〔目的〕
本発明は、上記した従来技術の問題点を克服
し、白色度が高くしかもヘツドマツチング性、熱
応答性が良い上、保存安定性にも優れた感熱記録
材料を提供することを目的とする。
〔構成〕
本発明によれば、支持体上に、ロイコ染料と顕
色剤を主成分とする感熱発色層を設けた感熱記録
材料において、該顕色剤として、下記一般式で表
わされるチオ尿素誘導体を用いると共に、該支持
体と感熱発色層との間に、感熱発色層と隣接し
て、熱可融性物質を含むアンダーコート層を設け
たことを特徴とする感熱記録材料が提供される。
（式中、R1は水素、アルキル基、ハロゲン化
アルキル基又はハロゲン、R2は水素、又は
[Technical Field] The present invention relates to a heat-sensitive recording material, and more particularly to a heat-sensitive recording material in which a heat-sensitive coloring layer containing a leuco dye and a color developer as main components, which are normally colorless or slightly pale at room temperature, is provided on a support. [Prior Art] Thermosensitive recording materials generally have a thermosensitive coloring layer containing a thermochromic composition as a main component on a support such as paper, synthetic paper, or plastic film.
Colored images can be obtained by heating with a thermal pen, laser light, etc. Compared to other recording materials, this type of recording material does not require complicated processing such as development and fixing, can produce records in a short time using relatively simple equipment, and generates less noise and pollutes the environment. ,
Due to its low cost and other advantages, it is used not only for copying books and documents, but also as a recording material in a wide range of applications such as electronic computers, facsimile machines, ticket vending machines, labels, and recorders. Thermochromic compositions used in such heat-sensitive recording materials generally consist of a color former and a color developer that causes the color former to develop color when heated. Examples of the color former include lactone, lactam, or colorless or spiropyran ring-containing compositions. Light-colored leuco dyes are used, and various acidic substances such as organic acids and phenolic substances are used as color developers. A recording material using a combination of a color forming agent and a color developing agent has the advantage that the resulting image has a particularly clear color tone, has a high background whiteness, and has excellent weather resistance of the image (dye image). ,
Widely used. However, in recent years, heat-sensitive recording methods have replaced other conventional recording methods, and as demand has increased, demands for improving the quality of heat-sensitive recording materials used in this method have also increased. With the increase in speed, there is an increasing demand for heat-sensitive recording materials with high sensitivity and excellent storage stability.
In response to this demand, as a method for improving the sensitivity of recording paper, for example, Japanese Patent Application Laid-Open No. 49-34842,
Addition of a thermofusible substance is known, as shown in JP-A-52-106746, etc., but in this case,
There is a problem in that head matching properties and storage stability are deteriorated. In addition, as a method for improving storage stability, Japanese Patent Application Laid-open No. 109454/1983 and Japanese Patent Publication No. 1987-109454
Mixing a specific leuco dye and a phenolic substance is known, as shown in Publication No. 43396, but this method has problems such as a decrease in whiteness and coloring of the background during heat-resistant storage. have. [Purpose] The purpose of the present invention is to overcome the problems of the prior art described above, and to provide a heat-sensitive recording material that has high whiteness, good head matching properties, good thermal response, and excellent storage stability. do. [Structure] According to the present invention, in a heat-sensitive recording material in which a heat-sensitive color forming layer containing a leuco dye and a color developer as main components is provided on a support, a thiourea represented by the following general formula is used as the color developer. Provided is a heat-sensitive recording material characterized in that the derivative is used and an undercoat layer containing a heat-fusible substance is provided between the support and the heat-sensitive color-forming layer and adjacent to the heat-sensitive color-forming layer. . (In the formula, R 1 is hydrogen, an alkyl group, a halogenated alkyl group, or a halogen, R 2 is hydrogen, or
本発明によれば、即ち、特定の顕色剤を含む感
熱発色層の下側に熱可融性物質を含むアンダーコ
ート層を設けたことにより、白色度が高く、高感
度で熱応答性が良い上にヘツドマツチング性も良
く、しかも保存安定性の優れた感熱記録材料がも
たらされる。
〔実施例〕
次に、本発明を実施例により更に詳細に説明す
る。なお、以下の部及び％は重量基準である。
実施例 １
〔Ａ液〕：
ステアリン酸アミド 30部
10％ポリビニルアルコール水溶液 10部
水 60部
〔Ｂ液〕：
３−（Ｎ−メチル−Ｎ−シクロヘキシルアミ
ノ）−６−メチル−７−アニリノフルオラン
20部
10％ポリビニルアルコール水溶液 20部
水 60部
〔Ｃ液〕：
１，３−ジ（ｍ−クロロフエニル）チオ尿素
20部
炭酸カルシウム 20部
10％ポリビニルアルコール水溶液 20部
水 40部
上記組成の混合物をそれぞれボールミルで72時
間分散しＡ液、Ｂ液及びＣ液を調製した後、Ａ液
を坪量50ｇ／m2の上質紙上に乾燥後の付着量が４
ｇ／m2となるよう塗布乾燥してアンダーコート層
を設けた。次にＢ液10部及びＣ液40部を混合し、
これをＢ液の乾燥後の重量が0.5ｇ／m2となるよ
う前記のアンダーコート層の上に塗布乾燥して本
発明の感熱記録材料を得た。
実施例 ２，３
実施例１において、Ａ液のステアリン酸アミド
に代えてテレフタル酸ジメチル（実施例２）及び
安息香酸−4′−ベンゾイルフエニル（実施例３）
をそれぞれ用いた以外は実施例１と同様にして本
発明の感熱記録材料を得た。
実施例 ４，５
実施例１において、Ｃ液の１，３−ジ（ｍ−ク
ロロフエニル）チオ尿素に代えて、１，３−ジ
（ｐ−メチルフエニル）チオ尿素（実施例４）及
び１，３−ジ（ｍ−トリフルオロメチルフエニ
ル）チオ尿素（実施例５）をそれぞれ用いた以外
は実施例１と同様にして本発明の感熱記録材料を
得た。
比較例 １，２，３
実施例１において、Ｃ液の１，３−ジ（ｍ−ク
ロロフエニル）チオ尿素に代えて、ビスフエノー
ルＡ（比較例１），ｐ−ヒドロキシ安息香酸ベンジ
ル（比較例２）及びｐ−ヒドロキシ安息香酸フエ
ネチル（比較例３）をそれぞれ用いた以外は実施
例１と同様にして比較用の感熱記録材料を得た。
比較例 ４
実施例１のＡ液20部、Ｂ液10部、Ｃ液40部を混
合して得た混合液を坪量50ｇ／m2の上質紙上にＢ
液の乾燥後の付着量が0.5ｇ／m2となるよう塗布
乾燥し比較用の感熱記録材料を得た。
比較例 ５
比較例４において、Ａ液のステアリン酸アミド
に代えてテレフタル酸ジメチルを用いた以外は比
較例４と同様にして比較用の感熱記録材料を得
た。
このようにして得られた本発明及び比較用の感
熱記録材料を用いて、Ｇサーマルフアクシミリ
（RIFAX 5320H(株)リコー製）にて記録し、その
時のヘツドマツチング性を観察すると共に、得ら
れた記録紙の発色画像濃度及び地肌濃度を測定し
た。なお、ヘツドマツチング性はサーマルヘツド
へのカス付着の程度及びステイツキングを以つて
詳価した。又、得られた記録紙を40℃90％RH及
び60℃DryRHの条件下にそれぞれ保つた恒温恒
湿室中に24時間放置し、再び濃度測定を行つた。
濃度測定はマクベスRD514（フイルターW106）
により行つた。試験結果を表−１に示す。
According to the present invention, by providing an undercoat layer containing a thermofusible substance under the thermosensitive color forming layer containing a specific color developer, the whiteness is high, the sensitivity is high, and the thermoresponsiveness is high. In addition, a heat-sensitive recording material having good head matching properties and excellent storage stability can be obtained. [Example] Next, the present invention will be explained in more detail with reference to Examples. Note that the following parts and percentages are based on weight. Example 1 [Liquid A]: Stearamide 30 parts 10% polyvinyl alcohol aqueous solution 10 parts Water 60 parts [Liquid B]: 3-(N-methyl-N-cyclohexylamino)-6-methyl-7-anilinoflu oran
20 parts 10% polyvinyl alcohol aqueous solution 20 parts Water 60 parts [Liquid C]: 1,3-di(m-chlorophenyl)thiourea
20 parts Calcium carbonate 20 parts 10% polyvinyl alcohol aqueous solution 20 parts Water 40 parts The mixtures with the above composition were each dispersed in a ball mill for 72 hours to prepare liquids A, B and C. The amount of adhesion after drying on high-quality paper is 4
An undercoat layer was provided by coating and drying to give a coating weight of g/m 2 . Next, mix 10 parts of liquid B and 40 parts of liquid C,
This was coated on the undercoat layer and dried so that the weight of liquid B after drying was 0.5 g/m 2 to obtain a heat-sensitive recording material of the present invention. Examples 2 and 3 In Example 1, dimethyl terephthalate (Example 2) and 4'-benzoylphenyl benzoate (Example 3) were used in place of stearamide in Solution A.
A heat-sensitive recording material of the present invention was obtained in the same manner as in Example 1 except that each of the following was used. Examples 4 and 5 In Example 1, 1,3-di(p-methylphenyl)thiourea (Example 4) and 1,3-di(m-chlorophenyl)thiourea were used in place of 1,3-di(m-chlorophenyl)thiourea in Solution C. The heat-sensitive recording material of the present invention was obtained in the same manner as in Example 1, except that -di(m-trifluoromethylphenyl)thiourea (Example 5) was used. Comparative Examples 1, 2, 3 In Example 1, bisphenol A (Comparative Example 1), benzyl p-hydroxybenzoate (Comparative Example 2) was used instead of 1,3-di(m-chlorophenyl)thiourea in Solution C. ) and p-hydroxybenzoate phenethyl (Comparative Example 3) were used in the same manner as in Example 1 to obtain a comparative heat-sensitive recording material. Comparative Example 4 A mixed solution obtained by mixing 20 parts of liquid A, 10 parts of liquid B, and 40 parts of liquid C in Example 1 was placed on high-quality paper with a basis weight of 50 g/m 2 .
A heat-sensitive recording material for comparison was obtained by applying and drying the liquid so that the amount of the liquid adhered after drying was 0.5 g/m 2 . Comparative Example 5 A comparative heat-sensitive recording material was obtained in the same manner as in Comparative Example 4, except that dimethyl terephthalate was used in place of stearamide in Liquid A. Using the heat-sensitive recording materials of the present invention and comparative heat-sensitive recording materials thus obtained, recording was performed using a G thermal facsimile (RIFAX 5320H manufactured by Ricoh Co., Ltd.), and the head matching properties at that time were observed. The color image density and background density of the recording paper were measured. The head matching property was evaluated in detail based on the degree of adhesion of residue to the thermal head and staking. Further, the obtained recording paper was left for 24 hours in a constant temperature and humidity room maintained under the conditions of 40°C, 90% RH and 60°C, DryRH, and the density was measured again.
Concentration measurement: Macbeth RD514 (filter W106)
I went there. The test results are shown in Table-1.
【表】【table】
【表】
表の結果から、本発明の感熱記録材料は高感度
であり、しかもヘツドマツチング性及び保存特性
に優れることがわかる。[Table] From the results shown in the table, it can be seen that the heat-sensitive recording material of the present invention has high sensitivity and excellent head matching properties and storage properties.
Claims (1)
する感熱発色層を設けた感熱記録材料において、
該顕色剤として、下記一般式で表わされるチオ尿
素誘導体を用いると共に、該支持体と感熱発色層
との間に、感熱発色層と隣接して、熱可融性物質
を含むアンダーコート層を設けたことを特徴とす
る感熱記録材料。 （式中、R1は水素、アルキル基、ハロゲン化
アルキル基又はハロゲン、R2は水素又は 【式】 （式中、R3は水素、アルキル基、ハロゲン化
アルキル基又はハロゲンを表わす）を表わす。）[Claims] 1. A heat-sensitive recording material in which a heat-sensitive coloring layer containing a leuco dye and a color developer as main components is provided on a support,
A thiourea derivative represented by the following general formula is used as the color developer, and an undercoat layer containing a thermofusible substance is provided between the support and the thermosensitive coloring layer, adjacent to the thermosensitive coloring layer. A heat-sensitive recording material characterized by: (In the formula, R 1 represents hydrogen, an alkyl group, a halogenated alkyl group, or a halogen, R 2 represents hydrogen or [Formula] (wherein, R 3 represents hydrogen, an alkyl group, a halogenated alkyl group, or a halogen) .)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58058893A JPS59184693A (en) | 1983-04-04 | 1983-04-04 | Thermal recording material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58058893A JPS59184693A (en) | 1983-04-04 | 1983-04-04 | Thermal recording material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59184693A JPS59184693A (en) | 1984-10-20 |
| JPH05231B2 true JPH05231B2 (en) | 1993-01-05 |
Family
ID=13097463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58058893A Granted JPS59184693A (en) | 1983-04-04 | 1983-04-04 | Thermal recording material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59184693A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0777828B2 (en) * | 1987-03-11 | 1995-08-23 | 富士写真フイルム株式会社 | Thermal recording material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59176088A (en) * | 1983-03-25 | 1984-10-05 | Ricoh Co Ltd | Thermal recording material |
-
1983
- 1983-04-04 JP JP58058893A patent/JPS59184693A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59176088A (en) * | 1983-03-25 | 1984-10-05 | Ricoh Co Ltd | Thermal recording material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59184693A (en) | 1984-10-20 |
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| JPS59136288A (en) | Heat-sensitive recording material | |
| JPS59133096A (en) | Heat-sensitive recording material | |
| JPH05231B2 (en) | ||
| JPH0211437B2 (en) | ||
| JPH0572272B2 (en) | ||
| JPS6363400B2 (en) | ||
| JPH0153199B2 (en) | ||
| JPS58211493A (en) | Heat-sensitive recording material | |
| JPS58166098A (en) | Heat-sensitive recording material | |
| JPH0570598B2 (en) | ||
| JPS58193190A (en) | Thermosensitive recording material | |
| JPH0456754B2 (en) | ||
| JPH0240517B2 (en) | ||
| JPH0226599B2 (en) | ||
| JPS59148695A (en) | Thermal recording type label | |
| JPS61193883A (en) | Thermal recording material | |
| JPS58205797A (en) | Heat-sensitive recording material | |
| JPS58211496A (en) | Heat-sensitive recording material | |
| JPS5820492A (en) | Heat sensitive recording material | |
| JPS58132589A (en) | Image recording material | |
| JPS58134792A (en) | Heat-sensitive recording material | |
| JPS5845092A (en) | Heat-sensitive recording material | |
| JPS61242883A (en) | Thermal recording material | |
| JPH0225351B2 (en) | ||
| JPS61163889A (en) | Thermal recording material |