JP4600846B2 - Thermal recording material - Google Patents

Thermal recording material Download PDF

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Publication number
JP4600846B2
JP4600846B2 JP2001094725A JP2001094725A JP4600846B2 JP 4600846 B2 JP4600846 B2 JP 4600846B2 JP 2001094725 A JP2001094725 A JP 2001094725A JP 2001094725 A JP2001094725 A JP 2001094725A JP 4600846 B2 JP4600846 B2 JP 4600846B2
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Japan
Prior art keywords
recording material
heat
color
parts
weight
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JP2001094725A
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Japanese (ja)
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JP2002293037A (en
Inventor
康広 大塚
喜栄 岡村
久登 坂爪
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Hokuetsu Kishu Paper Co Ltd
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Hokuetsu Kishu Paper Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、無色ないし淡色のロイコ染料と顕色剤を含有する発色記録層を設けた感熱記録体において、該発色記録層の発色部分である記録部の保存性に優れ、特に熱による非記録部(地肌)のかぶりが極めて少ない感熱記録体に関するものである。
【0002】
【従来の技術】
電子供与体である無色ないし淡色のロイコ染料と電子受容体である顕色剤とを含有する発色記録層を設けた感熱記録体は、比較的簡単な装置により記録画像が得られ、またハードのメンテナンスが容易ある等の利点からファクシミリ、ラベルプリンター、レコーダーの記録紙等に幅広く利用され、近年ではハンディターミナル、レジ用紙、券売機等に使用されるケースが増大している。
【0003】
しかし、ハンディターミナル、レジ用紙等に使用される場合、ハンディターミナル機器並び記録紙を車中に置くケースが多く、車内温度の増加によって記録濃度の低下や非記録部のかぶりといった現象が認められる。またハンディターミナル用紙、レジ用紙等は記録後、アルコール飲料、財布や手帳などの可塑剤に触れることも多く、接触による記録像の濃度の低下も認められる。そのため、耐可塑剤性、耐アルコール性等の保存性を備え、更に高温の環境条件下によっても非記録部のかぶりのない記録体が要望されている。
【0004】
【本発明が解決しようとする課題】
本発明は、上記要望に対処すべくなされたもので、記録によって得られた画像部の保存性に優れ、且つ高温条件下に曝されても地肌かぶりの少ない感熱記録体を提供することにある。
【0005】
【発明が解決するための手段】
本発明者等は、上記課題を解決するために鋭意検討した結果、支持体上に無色ないし淡色のロイコ染料と該ロイコ染料を加熱時に呈色させる顕色剤を含有する感熱層を有する感熱記録体において、該ロイコ染料に6´−[エチル(4−メチルフェニル)アミノ]−3´−メチル−2´−(フェニルアミノ)−スピロ[イソベンゾフラン−(3H),9´−(9H)キサンテン]−3−オン、6´−(ジエチルアミノ)−2´−[[3−(トリフルオロメチル)フェニル]アミノ]−スピロ[イソベンゾフラン−1(3H),9´−(9H)キサンテン]−3−オン及び−アニリノ−3−メチル−6−ジブチルアミノフルオランのいずれか一つを含有し、顕色剤として、1−(メチルアミノチオカルボニルアミノ)−3−(フェニルアミノカルボニルスルファモイル)ベンゼンを含有させ、得られた感熱記録体を150℃の加熱ブロックを800g/cmで5秒間感熱記録体に圧着したときの発色濃度がOD値で飽和濃度がOD値で1.20以上であって、100℃の加熱ブロックを800g/cmで5秒間感熱記録体に圧着したときの発色濃度がOD値で、0.25以下としたものである。
【0006】
【発明の実施の形態】
以下に、本発明の感熱記録体について、詳細に説明する。本発明は、支持体上にアンダーコート層、電子供与体である無色ないし淡色のロイコ染料と電子受容体である顕色剤とを含有する感熱記録層、さらに必要に応じて該感熱記録層上に保護層を順次形成した感熱記録体において、ロイコ染料として6´−[エチル(4−メチルフェニル)アミノ]−3´−メチル−2´−(フェニルアミノ)−スピロ[イソベンゾフラン−(3H),9´−(9H)キサンテン]−3−オン、6´−(ジエチルアミノ)−2´−[[3−(トリフルオロメチル)フェニル]アミノ]−スピロ[イソベンゾフラン−1(3H),9´−(9H)キサンテン]−3−オン及び−アニリノ−3−メチル−6−ジブチルアミノフルオランの少なくとも1種を用い、顕色剤として、1−(メチルアミノチオカルボニルアミノ)−3−(フェニルアミノカルボニルスルファモイル)ベンゼンを含有させ、保存性向上剤として4−ベンジルオキシ−4´−(2,3−エポキシ−2−メチルプロピ−1−イルオキシ)−ジフェニルスルホンを含有することを特徴としたものである。
【0007】
また、使用量としては特に限定されないが、感熱記録層の全固形分に対し、ロイコ染料は5〜25重量部、好ましくは10〜20重量部、顕色剤は15〜45重量部、好ましくは20〜40重量部である。
【0008】
さらに、感熱記録層には、記録部の保存性をより高める為の保存性向上剤として、4−ベンジルオキシ−4´−(2,3−エポキシ−2−メチルプロピ−1−イルオキシ)−ジフェニルスルホンを含有させることができる。更に、発色感度を高める為の増感剤としてシュウ酸ジ−P−メチル−クロルベンジル又は、4,4´−ジアリルエーテルジフェニルスルホンを含有させることができる。使用量としては特に限定されないが、感熱記録層の全固形分に対し、保存性向上剤がは1〜25重量部、好ましくは3〜20重量部、増感剤は1〜45重量部、好ましくは5〜40重量部であるがこれに限定されるものではない。
【0009】
感熱記録体の最上層に水溶性高分子樹脂または、水不溶性高分子と顔料を主体とした保護層を感熱記録層上に設けることで一層の保存性を向上した感熱記録体が提供される。
【0010】
次に本発明の代表的な使用条件及び製造条件を記する。
上記電子供与体である無色ないし淡色のロイコ染料6と、電子受容体である顕色剤と、増感剤とを含む塗液の製造は、一般に水を分散媒体とし、アトライター、ボールミル、サンドグラインダー等の攪拌・粉砕機により、各種感熱材料を各々別々に、または、2種類以上を分散剤とともに平均粒子径が0.5〜3μm程度となるように微分散した後、接着剤を添加し、混合攪拌して調製する。これを支持体上に乾燥重量が2〜10g/m、好ましくは3〜9g/mになる様、塗布乾燥して目的の感熱記録層が形成される。
【0011】
ここに使用される接着剤の具体例としては、ポリビニルアルコール、メチルセルロース、デンプン、カルボキシメチルセルロース、ヒドロキシエチルセルロース、カゼイン、アクリル酸エステル共重合体系ラテックス等の水溶性及び水分散性樹脂など。ポリビニルアルコール、メチルセルロース、デンプン、カルボキシメチルセルロース、ヒドロキシエチルセルロース、カゼイン、アクリル酸エステル共重合体系ラテックスが全固形分の5〜50重量%、好ましくは10〜30重量%程度配合される。
【0012】
更に、感熱記録体が記録機器や記録ヘッドとの接触によってステッキングを生じないように、塗液中にステアリン酸亜鉛、ステアリン酸カルシウム、パラフィンワックス等の分散液や、記録ヘッドのカス付着を改善するために、カオリン、クレー、タルク、炭酸カルシウム、水酸化アルミニウム、焼成クレー、酸化チタン、微粒子状無水シリカ等の無機顔料を添加することができる。
【0013】
支持体としては、紙、プラスチックフィルム、合成紙等が用いられる。
【0014】
発色均一性等のために、支持体と感熱記録層の間にアンダーコート層を設けることもできる。このアンダーコート層は、カオリン、クレー、タルク、炭酸カルシウム、水酸化アルミニウム、焼成クレー、酸化チタン、微粒子状無水シリカ等の無機顔料、スチレン、スチレン・アクリル共重合体、尿素樹脂などの有機顔料とポリビニルアルコール、メチルセルロース、デンプン、カルボキシメチルセルロース、ヒドロキシエチルセルロース、カゼイン、アクリル酸エステル共重合体系ラテックス、スチレン・ブタジエン共重合体系ラテックスなどの水溶性及び水分散性樹脂を各々単独あるいは、2種類以上使用可能である。
【0015】
また、感熱記録体上には記録層の保護等の目的でオーバーコート層を設けることも可能で、支持体の裏面に保護層を設けることも勿論可能で、感熱記録体製造分野における各種の公知技術が付加するものである。
【0016】
【実施例】
以下に本発明を実施例により、更に具体的に説明するが、勿論これらに限定されるものではない。また、特に断らない限り実施例、比較例中の部及び%はそれぞれ重量部及び重量%を示す。
【0017】
実施例1
▲1▼ アンダーコート層の形成
焼成クレーの40%分散液 35重量部
ポリビニルアルコール10%水溶液 30重量部
水 35重量部
上記組成物を混合しアンダーコート用塗液を調製した。この液を乾燥後の塗布量が6g/mとなるように上質紙に塗布・乾燥しアンダーコート層を形成した。
【0018】
(A−1液の調成)
6´−[エチル(4−メチルフェニル)アミノ]−3´−メチル−2´−(フェニル
アミノ)−スピロ[イソベンゾフラン−(3H),9´−(9H)キサンテン]−3−
オン 25重量部
ポリビニルアルコール15%水溶液 50重量部
水 25重量部
この組成物をサンドグラインダーで平均粒子径が1μmとなるまで粉砕した。
【0019】
(B−1液調成)
1−(メチルアミノチオカルボニルアミノ)−3−(フェニルアミノカルボニル
スルファモイル)ベンゼン 30重量部
ポリビニルアルコール15%水溶液 20重量部
水 50重量部
この組成物をサンドグラインダーで平均粒子径が1μmとなるまで粉砕した。
【0020】
(C−1液の調成)
4,4´−ジアリルエーテルジフェニルスルホン 30重量部
ポリビニルアルコール15%水溶液 20重量部
水 50重量部
【0021】
(E−1液調成)
4−ベンジルオキシ−4´−(2,3−エポキシ−2−メチルプロピ−1−イル
オキシ)−ジフェニルスルホン 25重量部
ポリビニルアルコール15%水溶液 50重量部
水 25重量部
この組成物をサンドグラインダーで平均粒子径が1μmとなるまで粉砕した。
【0022】
(D液調成)
炭酸カルシウム(50%分散液) 10重量部
ポリビニルアルコール(15%液) 35重量部
ステアリン酸亜鉛分散体(30%) 15重量部
水 40重量部
この組成物を分散機で分散し、D液とした。
【0023】
(記録層の形成)
A−1液10部、B−1液20部、C−1液20部、D液50部、この組成物を混合、攪拌し塗液とした。得られた塗液を上記アンダーコート層上に乾燥重量が6g/mとなるように塗布、乾燥し感熱記録体を得た。
【0024】
実施例2
(A−2液の調成)
実施例1のA−1液の調成に於いて6´−[エチル(4−メチルフェニル)アミノ]−3´−メチル−2´−(フェニルアミノ)−スピロ[イソベンゾフラン−(3H),9´−(9H)キサンテン]−3−オンの代わりに、−アニリノ−3−メチル−6−ジブチルアミノフルオランを使用して、A−2液を得た。
【0025】
(C−2液の調成)
実施例1のC−1液の調成に於いて4,4´−ジアリルエーテルジフェニルスルホンの代わりに、シュウ酸ジ−P−メチル−クロルベンジルを使用してC−2液を得た。A−1液の代わりにA−2液を使用し、C−1液の代わりにC−2液を使用した以外は、実施例1と同様にして感熱記録体を得た。
【0026】
実施例3
実施例1のA−1液の調製に於いて6´−[エチル(4−メチルフェニル)アミノ]−3´−メチル−2´−(フェニルアミノ)−スピロ[イソベンゾフラン−(3H),9´−(9H)キサンテン]−3−オンの代わりに、6´−(ジエチルアミノ)−2´−[[3−(トリフルオロメチル)フェニル]アミノ]−スピロ[イソベンゾフラン−1(3H),9´−(9H)キサンテン]−3−オンを使用して、A−3液を得た。A−1液の代わりにA−3液を用いた以外は実施例1と同様にして感熱記録体を得た。
【0027】
実施例4
(E液調成)
4−ベンジルオキシ−4´−(2,3−エポキシ−2−メチルプロピ−1−イル
オキシ)−ジフェニルスルホン 25重量部
ポリビニルアルコール15%水溶液 50重量部
水 25重量部
この組成物をサンドグラインダーで平均粒子径が1μmとなるまで粉砕し、E液を得た。
【0028】
(オーバーコート層の調成)
ポリビニルアルコール(15%液) 55重量部
パラフィンワックス分散体(30%液) 10重量部
ステアリン酸亜鉛分散体(30%液) 10重量部
水酸化アルミニウム 5重量部
水 20重量部
この組成物を混合攪拌してF液を得た。
【0029】
(記録層の形成)
A−1液10部、B−1液20部、C液20部、D液45部、E液5部、この組成物を混合、攪拌し塗液とした。得られた塗液を上記アンダーコート層上に乾燥重量が6g/mとなるように塗布乾燥し、得られた感熱記録体上にF液を感1g/mとなるように塗布乾燥し、感熱記録体を得た。
【0030】
実施例5
実施例4に於いてA−1液の代わりに、A−2液を用い、C−1液の代わりにC−2液を用いた以外は実施例4と同様にして感熱記録体を得た。
【0031】
実施例6
実施例4に於いてA−1液の代わりにA−3液を用いた以外は実施例4と同様にして感熱記録体を得た。
【0032】
実施例7
実施例2に於いて得られた塗液をアンダーコート層上に4gとなるように塗布乾燥した以外は、実施例2と同様にして感熱記録体を得た。
【0033】
比較例1
(B−2液の調成)
実施例1のB−1液の調成に於いて、1−(メチルアミノチオカルボニルアミノ)−3−(フェニルアミノカルボニルスルファモイル)ベンゼンの代わりに4,4−ジヒドロキシフェニルスルフォンを使用してB−2液を得た。
B−1液の代わりにB−2液を使用した以外は、実施例1と同様にして感熱記録体を得た。
【0034】
比較例2
実施例2に於いて、B−1の代わりにB−2液を使用した以外は、実施例2と同様にして感熱記録体を得た。
【0035】
比較例3
(B−3液の調成)
実施例1のB−1液の調成に於いて、1−(メチルアミノチオカルボニルアミノ)−3−(フェニルアミノカルボニルスルファモイル)ベンゼンの代わりにビス−(3−アリル−4−ヒドロキシフェニル)−スルホンを使用し、B−3液を得た。
B−1液の代わりにB−3液を使用した以外は実施例1と同様にして、感熱記録体を得た。
【0036】
比較例4
実施例5に於いて、B−1液の代わりにB−2液を使用した以外は、実施例5と同様にして感熱記録体を得た。
【0037】
比較例5
実施例5に於いて、B−1液の代わりにB−3液を使用した以外は、実施例5と同様にして感熱記録体を得た。
【0038】
比較例6
(B−4液の調成)
B−1液の調成において1−(メチルアミノチオカルボニルアミノ)−3−(フェニルアミノカルボニルスルファモイル)ベンゼンの代わりに日本曹達株式会社のD−90<Phenol,4,4´−sulfonylbis−,polymer with1,1′−oxybis〔2−chloroetane〕>を顕色剤として使用した以外は実施例1同様にして、感熱記録体を得た。
【0039】
比較例7
比較例3に於いて感熱液塗布量を4g/mとした以外は、比較例3同様にして感熱記録体を得た。
【0040】
上記実施例および比較例で、得られた感熱記録体は、次の評価を行ない、その結果を表1に示す。
【0041】
(1)100℃加温ブロック1秒間接触による発色濃度
東洋精機製、熱傾斜試験機で加温ブロック100℃,800g/cm、1秒間荷重下で発色を行い発色濃度を求めた。発色部の濃度を大日本スクリーン製造(製)DM-440型反射濃度計で測定した。
【0042】
(2)100℃加温ブロック1秒間接触による発色濃度
東洋精機製、熱傾斜試験機で加温ブロック100℃,800g/cm、1秒間荷重下で発色を行い発色濃度を求めた。発色部の濃度を大日本スクリーン製造(製)DM-440型反射濃度計で測定した。
【0043】
(3)発色性試験
感熱試験機 TH−FMR(大倉電機(製))を使用して評価した。印字は下記の条件で行った。
印加電圧 24.0V
印字パルス巾 1.0msec
印字エネルギー 0.5mj/dot
記録部及び非記録部の濃度を大日本スクリーン製造(製)DM-440型反射濃度計で測定した。
【0044】
(4)耐熱性試験1
80℃の高温度乾燥条件下に7時間保存した後、保存後の記録部と非記録部の濃度を測定した。
【0045】
(5)耐熱性試験2
90℃の高温度乾燥条件下に7時間保存した後、保存後の記録部と非記録部の濃度を測定した。
【0046】
(6)耐可塑剤性試験
プラッスチック消しゴム(株式会社トンボ鉛筆社製)を記録部に加重200g/cmの圧力で24時間接触し、試験後の記録部の濃度を測定した。
【0047】
(7)耐油性
ヒマシ油塗布後、40℃,90%RH条件下に24時間保存した後、保存後の記録部と非記録部の濃度を測定した。
【0048】
(8)耐アルコール性
50%エタノール液に2分間浸漬し、乾燥後に記録部と非記録部の濃度を測定した。
尚、保存試験に供した感熱記録体の記録部は印字エネルギーが0.498mj/dotで印字したものを使用し、記録部の濃度を大日本スクリーン製造(製)DM-440型反射濃度計で測定した。
【0049】
表1における(1)〜(3)の記録部の濃度測定値は、大きい数値ほど発色濃度が高いことを表している。
また(4)〜(8)に於ける試験後の非記録部の測定値は大きい数値ほど、試験後の地肌かぶりが酷く、着色が大きいことを示し、記録部の測定値は、大きい数値ほど試験後の濃度が高く、消色が少ないことを表している。
【0050】
【表1】

Figure 0004600846
【0051】
【発明の効果】
表1に示す如く実施例で得られた感熱記録体は良好な発色性を有し、いずれも比較例に比べ、記録部の保存性が良好で、且つ高温条件下での地肌かぶりが少ないことが判明した。
すなわち、本発明に係る感熱記録体は、発色記録層の発色部分である記録部の保存性に優れており、特に熱による非記録部(地肌)のかぶりが極めて少ないものである。
【0052】
また本発明はハンディターミナル用紙、レジ用紙等が記録後、アルコール飲料、財布や手帳などの可塑剤に触れるたり、あるいは、接触による記録像の濃度の低下に対しても、耐可塑剤性、耐アルコール性、耐濃度性等の保存性を備えている。[0001]
BACKGROUND OF THE INVENTION
The present invention provides a heat-sensitive recording material provided with a color-forming recording layer containing a colorless or light-colored leuco dye and a developer, and is excellent in storage stability of a recording portion which is a color-developing portion of the color-recording recording layer. The present invention relates to a heat-sensitive recording material with very little fogging of the part (background).
[0002]
[Prior art]
A heat-sensitive recording material provided with a color recording layer containing a colorless or light leuco dye as an electron donor and a developer as an electron acceptor can obtain a recorded image with a relatively simple device, Due to its advantages such as easy maintenance, it is widely used for facsimiles, label printers, recording paper for recorders, etc., and in recent years, it has been increasingly used for handy terminals, cash register paper, ticket vending machines and the like.
[0003]
However, when used for handy terminals, register sheets, etc., there are many cases where handy terminal devices and recording paper are placed in the vehicle, and a phenomenon such as a decrease in recording density or fogging of a non-recording portion is recognized due to an increase in the interior temperature. In addition, handy terminal paper, cash register paper, etc., often come into contact with plasticizers such as alcoholic beverages, wallets and notebooks after recording, and a decrease in the density of the recorded image due to contact is also observed. Therefore, there is a demand for a recording medium that has storage stability such as plasticizer resistance and alcohol resistance, and that does not have a non-recording portion fog even under high temperature environmental conditions.
[0004]
[Problems to be solved by the present invention]
SUMMARY OF THE INVENTION The present invention has been made in order to address the above-mentioned demands, and is to provide a heat-sensitive recording material which has excellent storage stability of an image portion obtained by recording and has little background fog even when exposed to high temperature conditions. .
[0005]
[Means for Solving the Invention]
As a result of intensive studies to solve the above-mentioned problems, the present inventors have made a heat-sensitive recording having a heat-sensitive layer containing a colorless or light-colored leuco dye and a color developer that develops the leuco dye upon heating on the support. The 6 '-[ethyl (4-methylphenyl) amino] -3'-methyl-2'-(phenylamino) -spiro [isobenzofuran- (3H), 9 '-(9H) xanthene ] -3-one, 6 '-(diethylamino) -2'-[[3- (trifluoromethyl) phenyl] amino] -spiro [isobenzofuran-1 (3H), 9 '-(9H) xanthene] -3 1- (methylaminothiocarbonylamino) -3- (phenylaminocarbonylsulfamoyl) containing any one of 2- one and 2 -anilino-3-methyl-6-dibutylaminofluorane as a developer ) When the obtained thermal recording medium is pressure-bonded to a thermal recording medium at 800 g / cm 2 for 5 seconds with a heating block of 150 ° C., the color density is OD value and the saturation density is 1.20 or more in OD value. The color density when the 100 ° C. heating block was pressure-bonded to the heat-sensitive recording medium at 800 g / cm 2 for 5 seconds was OD value of 0.25 or less.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The thermosensitive recording material of the present invention will be described in detail below. The present invention relates to a thermosensitive recording layer containing an undercoat layer on a support, a colorless or light leuco dye as an electron donor, and a developer as an electron acceptor, and if necessary, on the thermosensitive recording layer. 6 '-[ethyl (4-methylphenyl) amino] -3'-methyl-2'-(phenylamino) -spiro [isobenzofuran- (3H) as a leuco dye in a heat-sensitive recording material on which protective layers are sequentially formed. , 9 '-(9H) xanthen] -3-one, 6'-(diethylamino) -2 '-[[3- (trifluoromethyl) phenyl] amino] -spiro [isobenzofuran-1 (3H), 9' At least one of-(9H) xanthen] -3-one and 2 -anilino-3-methyl-6-dibutylaminofluorane was used, and 1- (methylaminothiocarbonylamino) -3- ( Phenylamino Carbonylsulfamoyl) benzene, and 4-benzyloxy-4 ′-(2,3-epoxy-2-methylprop-1-yloxy) -diphenylsulfone as a preservative improver It is.
[0007]
The amount used is not particularly limited, but the leuco dye is 5 to 25 parts by weight, preferably 10 to 20 parts by weight, and the developer is 15 to 45 parts by weight, preferably based on the total solid content of the heat-sensitive recording layer. 20 to 40 parts by weight.
[0008]
Further, in the heat-sensitive recording layer, 4-benzyloxy-4 ′-(2,3-epoxy-2-methylprop-1-yloxy) -diphenylsulfone is used as a preservability improver for further enhancing the preservability of the recording part. Can be contained. Furthermore, di-P-methyl-chlorobenzyl oxalate or 4,4′-diallyl ether diphenyl sulfone can be contained as a sensitizer for enhancing the color development sensitivity. The amount used is not particularly limited, but the preservability improver is 1 to 25 parts by weight, preferably 3 to 20 parts by weight, and the sensitizer is 1 to 45 parts by weight, preferably based on the total solid content of the thermosensitive recording layer Is 5 to 40 parts by weight, but is not limited thereto.
[0009]
By providing a protective layer mainly composed of a water-soluble polymer resin or a water-insoluble polymer and a pigment on the uppermost layer of the heat-sensitive recording material, a heat-sensitive recording material having further improved storage stability is provided.
[0010]
Next, typical use conditions and production conditions of the present invention will be described.
Production of a coating liquid containing the above-mentioned colorless or light leuco dye 6 as an electron donor, a developer as an electron acceptor, and a sensitizer is generally carried out using water as a dispersion medium, attritor, ball mill, sand Using a grinder or other agitator / pulverizer, heat-sensitive materials are dispersed separately, or two or more of them are finely dispersed with a dispersant so that the average particle size is about 0.5 to 3 μm, and then an adhesive is added. Prepare by mixing and stirring. This is coated and dried on the support so that the dry weight is 2 to 10 g / m 2 , preferably 3 to 9 g / m 2 , and the desired thermosensitive recording layer is formed.
[0011]
Specific examples of the adhesive used here include water-soluble and water-dispersible resins such as polyvinyl alcohol, methyl cellulose, starch, carboxymethyl cellulose, hydroxyethyl cellulose, casein, and acrylate copolymer latex. Polyvinyl alcohol, methyl cellulose, starch, carboxymethyl cellulose, hydroxyethyl cellulose, casein, and acrylate copolymer latex are mixed in an amount of 5 to 50% by weight, preferably about 10 to 30% by weight based on the total solid content.
[0012]
Furthermore, to prevent the thermal recording material from sticking due to contact with the recording device or the recording head, the dispersion of zinc stearate, calcium stearate, paraffin wax, etc. in the coating liquid and the adhesion of the recording head residue are improved. Therefore, inorganic pigments such as kaolin, clay, talc, calcium carbonate, aluminum hydroxide, calcined clay, titanium oxide, and particulate anhydrous silica can be added.
[0013]
As the support, paper, plastic film, synthetic paper or the like is used.
[0014]
An undercoat layer can be provided between the support and the heat-sensitive recording layer for color development uniformity and the like. This undercoat layer is composed of inorganic pigments such as kaolin, clay, talc, calcium carbonate, aluminum hydroxide, calcined clay, titanium oxide, fine particulate anhydrous silica, organic pigments such as styrene, styrene / acrylic copolymer, urea resin and the like. Water-soluble and water-dispersible resins such as polyvinyl alcohol, methyl cellulose, starch, carboxymethyl cellulose, hydroxyethyl cellulose, casein, acrylate copolymer latex and styrene / butadiene copolymer latex can be used alone or in combination of two or more. is there.
[0015]
Further, it is possible to provide an overcoat layer on the heat-sensitive recording material for the purpose of protecting the recording layer, and of course, a protective layer can be provided on the back surface of the support. Technology adds.
[0016]
【Example】
The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to these examples. Unless otherwise specified, “parts” and “%” in Examples and Comparative Examples represent “parts by weight” and “% by weight”, respectively.
[0017]
Example 1
(1) Formation of undercoat layer 40% dispersion of calcined clay 35 parts by weight 10% aqueous solution of polyvinyl alcohol 30 parts by weight Water 35 parts by weight The above composition was mixed to prepare an undercoat coating liquid. This liquid was applied and dried on fine paper so that the coating amount after drying was 6 g / m 2 to form an undercoat layer.
[0018]
(Preparation of A-1 liquid)
6 '-[Ethyl (4-methylphenyl) amino] -3'-methyl-2'-(phenylamino) -spiro [isobenzofuran- (3H), 9 '-(9H) xanthene] -3-
On 25 parts by weight Polyvinyl alcohol 15% aqueous solution 50 parts by weight Water 25 parts by weight This composition was pulverized with a sand grinder until the average particle size became 1 μm.
[0019]
(B-1 liquid preparation)
1- (Methylaminothiocarbonylamino) -3- (phenylaminocarbonylsulfamoyl) benzene 30 parts by weight Polyvinyl alcohol 15% aqueous solution 20 parts by weight Water 50 parts by weight This composition is averaged to 1 μm in a sand grinder. Until crushed.
[0020]
(Preparation of C-1 liquid)
4,4'-diallyl ether diphenyl sulfone 30 parts by weight Polyvinyl alcohol 15% aqueous solution 20 parts by weight Water 50 parts by weight
(E-1 liquid preparation)
4-Benzyloxy-4 '-(2,3-epoxy-2-methylprop-1-yloxy) -diphenylsulfone 25 parts by weight Polyvinyl alcohol 15% aqueous solution 50 parts by weight water 25 parts by weight This composition was averaged by a sand grinder It grind | pulverized until the diameter became 1 micrometer.
[0022]
(D liquid preparation)
Calcium carbonate (50% dispersion) 10 parts by weight polyvinyl alcohol (15% liquid) 35 parts by weight Zinc stearate dispersion (30%) 15 parts by weight Water 40 parts by weight did.
[0023]
(Formation of recording layer)
A-1 liquid 10 parts, B-1 liquid 20 parts, C-1 liquid 20 parts, D liquid 50 parts, this composition was mixed and stirred to obtain a coating liquid. The obtained coating liquid was applied onto the undercoat layer so that the dry weight was 6 g / m 2 and dried to obtain a heat-sensitive recording material.
[0024]
Example 2
(Preparation of liquid A-2)
In preparation of the liquid A-1 of Example 1, 6 ′-[ethyl (4-methylphenyl) amino] -3′-methyl-2 ′-(phenylamino) -spiro [isobenzofuran- (3H), Instead of 9 '-(9H) xanthen] -3-one, 2 -anilino-3-methyl-6-dibutylaminofluorane was used to obtain liquid A-2.
[0025]
(C-2 liquid preparation)
C-2 solution was obtained by using di-P-methyl-chlorobenzyl oxalate instead of 4,4'-diallyl ether diphenylsulfone in the preparation of solution C-1 of Example 1. A thermosensitive recording material was obtained in the same manner as in Example 1 except that the A-2 solution was used instead of the A-1 solution and the C-2 solution was used instead of the C-1 solution.
[0026]
Example 3
In the preparation of the liquid A-1 of Example 1, 6 '-[ethyl (4-methylphenyl) amino] -3'-methyl-2'-(phenylamino) -spiro [isobenzofuran- (3H), 9 Instead of '-(9H) xanthen] -3-one, 6'-(diethylamino) -2 '-[[3- (trifluoromethyl) phenyl] amino] -spiro [isobenzofuran-1 (3H), 9 A-3 liquid was obtained using '-(9H) xanthen] -3-one. A heat-sensitive recording material was obtained in the same manner as in Example 1 except that the A-3 solution was used instead of the A-1 solution.
[0027]
Example 4
(E liquid preparation)
4-Benzyloxy-4 '-(2,3-epoxy-2-methylprop-1-yloxy) -diphenylsulfone 25 parts by weight Polyvinyl alcohol 15% aqueous solution 50 parts by weight water 25 parts by weight This composition was averaged by a sand grinder The mixture was pulverized until the diameter became 1 μm to obtain liquid E.
[0028]
(Formation of overcoat layer)
Polyvinyl alcohol (15% solution) 55 parts by weight Paraffin wax dispersion (30% solution) 10 parts by weight Zinc stearate dispersion (30% solution) 10 parts by weight Aluminum hydroxide 5 parts by weight Water 20 parts by weight The solution F was obtained by stirring.
[0029]
(Formation of recording layer)
A-1 liquid 10 parts, B-1 liquid 20 parts, C liquid 20 parts, D liquid 45 parts, E liquid 5 parts, this composition was mixed and stirred to obtain a coating liquid. The obtained coating solution was applied and dried on the undercoat layer so that the dry weight was 6 g / m 2, and the F solution was applied and dried on the obtained thermosensitive recording body so that the sensitivity was 1 g / m 2. A heat-sensitive recording material was obtained.
[0030]
Example 5
A thermal recording material was obtained in the same manner as in Example 4 except that the A-2 solution was used instead of the A-1 solution and the C-2 solution was used instead of the C-1 solution in Example 4. .
[0031]
Example 6
A heat-sensitive recording material was obtained in the same manner as in Example 4 except that the A-3 solution was used instead of the A-1 solution in Example 4.
[0032]
Example 7
A heat-sensitive recording material was obtained in the same manner as in Example 2 except that the coating liquid obtained in Example 2 was applied and dried on the undercoat layer so as to be 4 g.
[0033]
Comparative Example 1
(Preparation of B-2 liquid)
In the preparation of the B-1 solution of Example 1, 4,4-dihydroxyphenylsulfone was used instead of 1- (methylaminothiocarbonylamino) -3- (phenylaminocarbonylsulfamoyl) benzene. B-2 liquid was obtained.
A heat-sensitive recording material was obtained in the same manner as in Example 1 except that the B-2 solution was used instead of the B-1 solution.
[0034]
Comparative Example 2
In Example 2, a heat-sensitive recording material was obtained in the same manner as in Example 2 except that the liquid B-2 was used instead of B-1.
[0035]
Comparative Example 3
(Preparation of B-3 solution)
In the preparation of the B-1 solution of Example 1, bis- (3-allyl-4-hydroxyphenyl) was used instead of 1- (methylaminothiocarbonylamino) -3- (phenylaminocarbonylsulfamoyl) benzene. ) -Sulfone was used to obtain B-3 solution.
A heat-sensitive recording material was obtained in the same manner as in Example 1 except that the B-3 solution was used instead of the B-1 solution.
[0036]
Comparative Example 4
In Example 5, a thermosensitive recording material was obtained in the same manner as in Example 5 except that the B-2 solution was used instead of the B-1 solution.
[0037]
Comparative Example 5
In Example 5, a heat-sensitive recording material was obtained in the same manner as in Example 5 except that the B-3 solution was used instead of the B-1 solution.
[0038]
Comparative Example 6
(Preparation of B-4 liquid)
D-90 <Phenol, 4,4'-sulfonylbis- of Nippon Soda Co., Ltd. instead of 1- (methylaminothiocarbonylamino) -3- (phenylaminocarbonylsulfamoyl) benzene in the preparation of solution B-1. , polymer with 1,1′-oxybis [2-chloroetane]> was used as a developer to obtain a heat-sensitive recording material in the same manner as in Example 1.
[0039]
Comparative Example 7
A heat-sensitive recording material was obtained in the same manner as in Comparative Example 3, except that the coating amount of the heat-sensitive liquid was 4 g / m 2 in Comparative Example 3.
[0040]
The thermal recording materials obtained in the examples and comparative examples were evaluated as follows, and the results are shown in Table 1.
[0041]
(1) Color density by contact at 100 ° C. heating block for 1 second The color density was determined by coloring with a heating block 100 ° C., 800 g / cm 2 under a load for 1 second using a thermal gradient tester manufactured by Toyo Seiki. The density of the colored portion was measured with a DM-440 reflection densitometer manufactured by Dainippon Screen Mfg.
[0042]
(2) Color density by contact at 100 ° C. heating block for 1 second The color density was determined by coloring with a heating block 100 ° C., 800 g / cm 2 under a load for 1 second using a thermal gradient tester manufactured by Toyo Seiki. The density of the colored portion was measured with a DM-440 reflection densitometer manufactured by Dainippon Screen Mfg.
[0043]
(3) Color development test Thermal test machine Evaluation was performed using a TH-FMR (Okura Electric Co., Ltd.). Printing was performed under the following conditions.
Applied voltage 24.0V
Printing pulse width 1.0msec
Printing energy 0.5mj / dot
The density of the recording area and the non-recording area was measured with a DM-440 reflection densitometer manufactured by Dainippon Screen Mfg.
[0044]
(4) Heat resistance test 1
After storing for 7 hours under high temperature drying conditions at 80 ° C., the density of the recorded and non-recorded areas after storage was measured.
[0045]
(5) Heat resistance test 2
After storing for 7 hours under high temperature drying conditions at 90 ° C., the density of the recorded and non-recorded areas after storage was measured.
[0046]
(6) Plasticizer resistance test A plastic eraser (manufactured by Dragonfly Pencil Co., Ltd.) was brought into contact with the recording part at a load of 200 g / cm 2 for 24 hours, and the density of the recording part after the test was measured.
[0047]
(7) After application of oil-resistant castor oil, it was stored under conditions of 40 ° C. and 90% RH for 24 hours, and then the density of the recorded portion and the non-recorded portion after storage was measured.
[0048]
(8) Alcohol resistance It was immersed in an ethanol solution of 50% for 2 minutes, and after drying, the density of the recorded part and the non-recorded part was measured.
In addition, the recording part of the thermosensitive recording material used for the storage test was printed with a printing energy of 0.498 mj / dot, and the density of the recording part was measured by a DM-440 reflection densitometer manufactured by Dainippon Screen Mfg. It was measured.
[0049]
The measured density values of the recording parts (1) to (3) in Table 1 indicate that the larger the numerical value, the higher the color density.
In (4) to (8), the measured value of the non-recorded part after the test indicates that the larger the numerical value, the more severe the background fog after the test and the greater the coloring. The larger the measured value of the recorded part, the greater the measured value. It indicates that the concentration after the test is high and the color erasure is small.
[0050]
[Table 1]
Figure 0004600846
[0051]
【The invention's effect】
As shown in Table 1, the heat-sensitive recording materials obtained in the examples have good color developability, both of which have better storage stability of the recording area and less background fogging under high temperature conditions as compared with the comparative examples. There was found.
That is, the heat-sensitive recording material according to the present invention is excellent in the storage stability of the recording portion which is the color development portion of the color development recording layer, and particularly the fog of the non-recording portion (background) due to heat is extremely small.
[0052]
In addition, the present invention can also be used to prevent plasticizer resistance and resistance to contact with plasticizers such as alcoholic beverages, wallets and notebooks after recording on handy terminal paper, cash register paper, etc. Preserves such as alcohol and concentration resistance.

Claims (4)

支持体上に、電子供与体である無色ないし淡色のロイコ染料と、電子受容体である顕色剤とを含有する発色記録層を設けた感熱記録体において、該無色ないし淡色のロイコ染料として6´−[エチル(4−メチルフェニル)アミノ]−3´−メチル−2´−(フェニルアミノ)−スピロ[イソベンゾフラン−(3H),9´−(9H)キサンテン]−3−オン、−アニリノ−3−メチル−6−ジブチルアミノフルオラン、6´−(ジエチルアミノ)−2´−[[3−(トリフルオロメチル)フェニル]アミノ]−スピロ[イソベンゾフラン−1(3H),9´−(9H)キサンテン]−3−オンのいずれか一つを含有し、前記顕色剤として、1−(メチルアミノチオカルボニルアミノ)−3−(フェニルアミノカルボニルスルファモイル)ベンゼンを含有させ、150℃の加熱ブロックを800g/cmで5秒間感熱記録体に圧着したときの発色濃度がOD値で1.20以上であって、100℃の加熱ブロックを800g/cmで5秒間感熱記録体に圧着したときの発色濃度がOD値で、0.25以下であることを特徴とする感熱記録体。In a heat-sensitive recording medium provided with a color-forming recording layer containing a colorless or light leuco dye as an electron donor and a developer as an electron acceptor on a support, the colorless or light leuco dye is 6 '-[Ethyl (4-methylphenyl) amino] -3'-methyl-2'-(phenylamino) -spiro [isobenzofuran- (3H), 9 '-(9H) xanthen] -3-one, 2- Anilino-3-methyl-6-dibutylaminofluorane, 6 '-(diethylamino) -2'-[[3- (trifluoromethyl) phenyl] amino] -spiro [isobenzofuran-1 (3H), 9'- (9H) xanthene] -3 contain any one of the on, as the color developer, 1- (methylamino thiocarbonyl) -3- (phenylaminocarbonyl sulfamoyl) is contained benzene, 15 The ° C. heating block comprising at 1.20 or higher color density OD value when crimped to 5 seconds thermosensitive recording medium with 800 g / cm 2, 5 seconds heat-sensitive recording material of the heating block at 100 ° C. at 800 g / cm 2 A heat-sensitive recording material characterized in that the color density when it is pressure-bonded to the surface is an OD value of 0.25 or less. 前記支持体上の発色記録層に、保存安定剤として、4−ベンジルオキシ−4´−(2,3−エポキシ−2−メチルプロピ−1−イルオキシ)−ジフェニルスルホンを含有することを特徴とする請求項1記載の感熱記録体。 The colored recording layer on the support contains 4-benzyloxy-4 '-(2,3-epoxy-2-methylprop-1-yloxy) -diphenylsulfone as a storage stabilizer. Item 2. The thermal recording material according to Item 1. 前記支持体上の発色記録層に、増感剤として、シュウ酸ジ−P−メチル−クロルベンジル又は、4,4´−ジアリルエーテルジフェニルスルホンを含有することを特徴とする請求項1又は2記載の感熱記録体。 3. The color-forming recording layer on the support contains di-P-methyl-chlorobenzyl oxalate or 4,4′-diallyl ether diphenyl sulfone as a sensitizer. Thermal recording material. 前記支持体上の発色記録層上に、水溶性高分子樹脂または、水不溶性高分子と顔料を主体とした保護層を設けたことを特徴とする請求項1、2又は3記載の感熱記録体。 4. The heat-sensitive recording material according to claim 1, wherein a protective layer mainly comprising a water-soluble polymer resin or a water-insoluble polymer and a pigment is provided on the color recording layer on the support. .
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08216528A (en) * 1995-02-16 1996-08-27 New Oji Paper Co Ltd Thermal recording material
JPH10100534A (en) * 1996-09-30 1998-04-21 Oji Paper Co Ltd Thermosensitive recording medium and its using method
JPH10193803A (en) * 1997-01-17 1998-07-28 Mitsubishi Paper Mills Ltd Thermal recording material
JPH10203025A (en) * 1997-01-28 1998-08-04 Oji Paper Co Ltd Thermal recording body
JPH11291633A (en) * 1998-04-08 1999-10-26 Oji Paper Co Ltd Heat-sensitive recording body

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08216528A (en) * 1995-02-16 1996-08-27 New Oji Paper Co Ltd Thermal recording material
JPH10100534A (en) * 1996-09-30 1998-04-21 Oji Paper Co Ltd Thermosensitive recording medium and its using method
JPH10193803A (en) * 1997-01-17 1998-07-28 Mitsubishi Paper Mills Ltd Thermal recording material
JPH10203025A (en) * 1997-01-28 1998-08-04 Oji Paper Co Ltd Thermal recording body
JPH11291633A (en) * 1998-04-08 1999-10-26 Oji Paper Co Ltd Heat-sensitive recording body

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