JP7456708B1 - 感熱記録体 - Google Patents
感熱記録体 Download PDFInfo
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- JP7456708B1 JP7456708B1 JP2022162728A JP2022162728A JP7456708B1 JP 7456708 B1 JP7456708 B1 JP 7456708B1 JP 2022162728 A JP2022162728 A JP 2022162728A JP 2022162728 A JP2022162728 A JP 2022162728A JP 7456708 B1 JP7456708 B1 JP 7456708B1
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- -1 diphenyl sulfone compound Chemical class 0.000 claims abstract description 82
- 238000003860 storage Methods 0.000 claims abstract description 48
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- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 3
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- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 3
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- MTMKZABGIQJAEX-UHFFFAOYSA-N 4,4'-sulfonylbis[2-(prop-2-en-1-yl)phenol] Chemical compound C1=C(CC=C)C(O)=CC=C1S(=O)(=O)C1=CC=C(O)C(CC=C)=C1 MTMKZABGIQJAEX-UHFFFAOYSA-N 0.000 description 2
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Images
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- Heat Sensitive Colour Forming Recording (AREA)
Abstract
Description
なお、明細書において、「発色性」とは、感熱記録体の加熱により無地部が黒色に変化する能力を意味し、「印字保存性」とは、発色した印字部の濃度(発色濃度)が、各種保存条件で低下しにくい能力を意味するものとする。
また、本発明の感熱記録体は、前記保存性向上剤として、分子内にフェノール性水酸基を3個以上有する化合物を含有する。
中空率={(空隙の体積)/(中空粒子の体積)}×100
その他の顕色剤としては、例えば、1,1-ビス(p-ヒドロキシフェニル)シクロヘキサン、1,1-ビス(p-ヒドロキシフェニル)プロパン、2,2-ビス(p-ヒドロキシフェニル)プロパン、2,2-ビス(p-ヒドロキシフェニル)ブタン、1,1-ビス(4-ヒドロキシフェニル)-1-フェニルエタン、2,2’-メチレンビス(4-クロロフェノール)、2,2-ビス(4-ヒドロキシフェニル)-4-メチルペンタン、ポリ(4-ヒドロキシ安息香酸)、4-ヒドロキシ安息香酸ベンジル、2,4-ビス(フェニルスルホニル)フェノール、α-{4-[(4-ヒドロキシフェニル)スルホニル]フェニル}-ω-ヒドロキシポリ(重合度n=1~7)(オキシエチレンオキシエチレンオキシ-p-フェニレンスルホニル-p-フェニレン)、3,5-ビス(α-メチルベンジル)サリチル酸、ビス[4-(n-オクチルオキシカルボニルアミノ)サリチル酸亜鉛]、4,4’-ビス(p-トリルスルホニルアミノカルボニルアミノ)ジフェニルメタン、4-ヒドロキシベンゼンスルホンアニリド、2’-(3-フェニルウレイド)ベンゼンスルホンアニリド、N-(2-ヒドロキシフェニル)-2-[(4-ヒドロキシフェニル)チオ]アセトアミド、N-(4-ヒドロキシフェニル)-2-[(4-ヒドロキシフェニル)チオ]アセトアミド、4-[[4-[4-[4-[[4-(1-メチルエトキシ)フェニル]スルホニルフェノキシ]ブトキシ]フェニル]スルホニル]フェノール、4-tert-ブチルフェノール・ホルムアルデヒド重縮合物、N-(p-トルエンスルホニル)-N’-(3-p-トルエンスルホニルオキシフェニル)ウレア、1-フェニル-3-(4-メチルフェニルスルホニル)ウレア等が挙げられる。
その他の保存性向上剤としては、例えば、ナトリウム-2,2’-メチレンビス(4,6-ジ-t-ブチルフェニル)ホスファイト、4,4’-ブチリデンビス(3-メチル-6-t-ブチルフェノール)、4-(2-メチルグリシルオキシ)-4’-ベンジルオキシジフェニルスルホン、2,2’-メチレンビス(4-メチル-6-t-ブチルフェノール)、2,2’-メチレンビス(4-エチル-6-t-ブチルフェノール)、ジエチルチオウレア、ジブチルジチオカルバミン酸亜鉛、及び4,4’-チオビス(6-t-ブチル-m-クレゾール)等が挙げられる。
(感熱記録体の作製)
<アンダーコート層>
基材である坪量70g/m2の上質紙(厚さ:80μm)上に、中空粒子(固形分濃度26.5%、ローペイクHP-1055:ローム・アンド・ハース・ジャパン株式会社)70質量部、変性スチレンブタジエンラテックス(固形分濃度49%)10質量部、水20質量部の割合になった組成物を混合攪拌させたアンダーコート層用塗液を塗布し、乾燥させて、乾燥時の塗布量が3.0g/m2であり、厚さが5μmのアンダーコート層を形成した。
表1に示す感熱記録層形成用の塗液を調製し、調製した感熱記録層形成用の塗液を、上述のアンダーコート層上に、塗布量が、乾燥重量で4.0g/m2となるように塗布した後、乾燥を行うことにより、アンダーコート層上に厚さが3.5μmの感熱記録層を形成した。なお、表1において、各配合材料の数値は、乾燥時における重量比率を示している。
アクリルエマルジョン(固形分濃度30%)液を、上述の感熱記録層上に塗布し、これを乾燥させて、乾燥時の塗布量が1.6g/m2であり、厚さが1.5μmの中間層を形成した。
アクリルエマルジョン(固形分濃度20%)が40質量部、炭酸カルシウムが5質量部、ポリエチレンワックス(固形分濃度40%)が15質量部、水が40質量部の割合になったものを混合攪拌させて得た液を、中間層上に塗布し、これを乾燥させて、乾燥時の塗布量が1.0g/m2であり、厚さが0.9μmのトップコート層を形成した。
動感度試験では、各実施例及び各比較例における各感熱記録体に対して、印字エネルギーを異ならせて印字を行い、それぞれの印字エネルギーにおける光学濃度(印字部のOD値)を測定した。この測定結果から、各実施例及び各比較例における各感熱記録体の動感度を評価した。以下、動感度試験の手順について説明する。
耐水性評価では、各実施例及び各比較例における各感熱記録体を水中に浸漬した印字部について、光学濃度(印字部のOD値)を測定した。この測定結果から、各実施例及び各比較例における各感熱記録体の耐水性を評価した。以下、耐水性評価の手順について説明する。なお、上記の光学濃度には、発色濃度の意義が含まれる。以下、耐水性試験、耐次亜塩素酸性試験、耐湿熱性試験、経時印字保存性試験における光学濃度も、同様である。
耐次亜塩素酸性評価では、各実施例及び各比較例における各感熱記録体を次亜塩素酸水溶液中に浸漬した印字部について、光学濃度(印字部のOD値)を測定した。この測定結果から、各実施例及び各比較例における各感熱記録体の耐次亜塩素酸性を評価した。以下、耐次亜塩素酸性評価の手順について説明する。
耐湿熱性評価では、各実施例及び各比較例における各感熱記録体を湿熱条件に保存した印字部について、光学濃度(印字部のOD値)を測定した。この測定結果から、各実施例及び各比較例における各感熱記録体の耐湿熱性を評価した。以下、耐湿熱性評価の手順について説明する。
経時印字保存性評価では、各実施例及び各比較例における各感熱記録体を加熱乾燥条件で保存した印字部について、光学濃度(印字部のOD値)を測定した。この測定結果から、各実施例及び各比較例における各感熱記録体の経時印字保存性を評価した。以下、経時印字保存性評価の手順について説明する。
表2、3に示す結果から下記のことが確認できた。
顕色剤としてジフェニルスルホン化合物のみを含み、ウレアウレタン化合物及び保存性向上剤を含まない比較例1、顕色剤としてジフェニルスルホン化合物及びウレアウレタン化合物を含むが、保存性向上剤を含まない比較例2は、耐水性、耐次亜塩素酸性、耐湿熱性、経時印字保存性の何れにおいても、顕色剤としてジフェニルスルホン化合物及びウレアウレタン化合物を含み、保存性向上剤として分子内にフェノール性水酸基を3個有する化合物を含む実施例に比べて、印字部のOD値が大きく低下し、印字保存性に劣るものであった。
一方、顕色剤としてジフェニルスルホン化合物及びウレアウレタン化合物を含み、保存性向上剤として分子内にフェノール性水酸基を2個有する化合物を含む比較例3は、実施例と同等の発色性、耐水性、及び経時印字保存性を示したが、耐次亜塩素酸性、耐湿熱性では、印字部のOD値が、実施例と比べて低下するものであった。
以上の結果より、顕色剤としてジフェニルスルホン化合物及びウレアウレタン化合物を含み、保存性向上剤として分子内にフェノール性水酸基を3個有する化合物を含む感熱記録層を有する感熱記録体は、発色性に優れると共に、発色濃度が低下しにくく、印字保存性にも優れることが分かる。
〔付記1〕
基材上に、感熱記録層が積層された感熱記録体であって、
前記感熱記録層は、発色剤と、顕色剤と、保存性向上剤とを含有し、
前記顕色剤として、下記式(1)で表されるジフェニルスルホン化合物を含有し、
前記保存性向上剤として、分子内にフェノール性水酸基を3個以上有する化合物を含有することを特徴とする、感熱記録体。
〔付記2〕
前記顕色剤として、さらに、下記式(2)で表されるウレアウレタン化合物を含有する、付記1に記載の感熱記録体。
前記感熱記録層の全体に対する前記ジフェニルスルホン化合物の含有量が、10質量%以上40質量%以下である、付記1又は2に記載の感熱記録体。
〔付記4〕
前記感熱記録層の全体に対する前記分子内にフェノール性水酸基を3個以上有する化合物の含有量が、1質量%以上10質量%以下である、付記1~3のいずれか1つに記載の感熱記録体。
2 基材
3 感熱記録層
4 中間層
5 トップコート層
6 アンダーコート層
Claims (4)
- 基材上に、感熱記録層が積層された感熱記録体であって、
前記感熱記録層は、発色剤と、顕色剤と、保存性向上剤とを含有し、
前記顕色剤として、下記式(1)で表されるジフェニルスルホン化合物を含有し、
前記ジフェニルスルホン化合物は、4-ヒドロキシ-4’-n-プロポキシジフェニルスルホンを含有し、
前記保存性向上剤として、1,1,3-トリス(2-メチル-4-ヒドロキシ-5-t-ブチルフェニル)ブタン、1,1,3-トリス(2-メチル-4-ヒドロキシ-5-シクロヘキシルフェニル)ブタン、及びトリス(2,6-ジメチル-4-t-ブチル-3-ヒドロキシベンジル)イソシアヌレートからなる群から選ばれる少なくとも1種の化合物を含有することを特徴とする、感熱記録体。 - 前記感熱記録層の全体に対する前記ジフェニルスルホン化合物の含有量が、10質量%以上40質量%以下である、請求項1又は2に記載の感熱記録体。
- 前記感熱記録層の全体に対する前記1,1,3-トリス(2-メチル-4-ヒドロキシ-5-t-ブチルフェニル)ブタン、1,1,3-トリス(2-メチル-4-ヒドロキシ-5-シクロヘキシルフェニル)ブタン、及びトリス(2,6-ジメチル-4-t-ブチル-3-ヒドロキシベンジル)イソシアヌレートからなる群から選ばれる少なくとも1種の化合物の含有量が、1質量%以上10質量%以下である、請求項1又は2に記載の感熱記録体。
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JP2007125744A (ja) | 2005-11-02 | 2007-05-24 | Oji Paper Co Ltd | 感熱記録体 |
JP2009072948A (ja) | 2007-09-19 | 2009-04-09 | Nippon Paper Industries Co Ltd | 感熱記録体 |
JP2013188987A (ja) | 2012-03-15 | 2013-09-26 | Nippon Paper Industries Co Ltd | 感熱記録材料 |
JP2013237234A (ja) | 2012-05-17 | 2013-11-28 | Osaka Sealing Printing Co Ltd | 感熱記録材料および感熱記録紙 |
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JP2007125744A (ja) | 2005-11-02 | 2007-05-24 | Oji Paper Co Ltd | 感熱記録体 |
JP2009072948A (ja) | 2007-09-19 | 2009-04-09 | Nippon Paper Industries Co Ltd | 感熱記録体 |
JP2013188987A (ja) | 2012-03-15 | 2013-09-26 | Nippon Paper Industries Co Ltd | 感熱記録材料 |
JP2013237234A (ja) | 2012-05-17 | 2013-11-28 | Osaka Sealing Printing Co Ltd | 感熱記録材料および感熱記録紙 |
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