JP3557054B2 - Recorded body - Google Patents
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【０００１】
【発明の属する技術分野】
本発明は記録体に関し、詳しくは、表面が適度に粗面化されかつ潜像及び顕像が良好に得られる記録層を有する記録体に関する。
【０００２】
【従来の技術】
液体と接触した状態で加熱すると後退接触角が低下する性質を有する材料を記録層とした記録体、及びこれを用いた記録法は例えば特開平３−１７８４７８号公報等に詳しく説明されている。
この種の記録体においては、その記録層表面が程よく粗面化されているのがインクを記録層表面の必要箇所に万遍無く付着できる上から有利であり、そのため、図７に示したように、粗面基板１’に記録層２を形成することが考えられた。だが、基板を粗面化するための製造コストは通常の基板（例えばＰＥＴ透明フィルム（東レ社製 Ｓ−１０など））に比べ１．５倍から２倍程度高くなっているのが実状である。
【０００３】
そこで本発明者らは記録層表面の粗面化についての技術を数多く提案しており、中でも(1)記録層中に微粒子状の帯電防止剤を添加させる（特開平４−１６３０８５号公報）、(2)記録層中に結晶性ポリマーを含有させる（特開平４−１６３０８３号公報）、及び(3)記録層中に充填剤を添加させる（特開平４−１６３０８６号公報）などがその代表例である。
【０００４】
【発明が解決しようとする課題】
しかしながら、上記の粗面化技術には一長一短があり、更なる良好な記録層表面の粗面化が求められている。従って、本発明の目的は、低製造コストでかつ適度な表面粗さを有する記録体を提供するものである。
【０００５】
【課題を解決するための手段】
すなわち、本発明によれば、（１）液体と接触した状態で加熱すると後退接触角が低下する性質をもつ材料を記録層として有し、画像信号に応じて選択的に該記録層表面を加熱して潜像を書き込み、その潜像書き込み時又は後に、色材を含有したインクを接触させて該潜像を可視化する記録方法に利用されるものであって、該記録層中に体積平均粒子径が４μｍ以下の弾性微粒子を含有することを特徴とする記録体が提供される。
【０００６】
また本発明によれば、（２）液体と接触した状態で加熱すると後退接触角が低下する性質をもつ材料を記録層として有し、画像信号に応じて選択的に該記録層表面を加熱して潜像を書き込み、その潜像書き込み時又は後に、色材を含有したインクを接触させて該潜像を可視化する記録方法に利用されるものであって、基板上に記録層材料と体積平均粒子系が４μｍ以下の微粒子を混合した層を有し、この微粒子を混合した層上に微粒子を含まない記録層材料のみの層を有することを特徴とする記録体が提供される。
【０００７】
さらに本発明によれば、（３）前記（２）において、微粒子を含有した記録層形成液を塗布後、コロナ放電処理、電子線照射又は紫外線照射して被膜形成した後、この微粒子を含有した層上に微粒子を含まない記録層材料のみの層を形成したことを特徴とする記録体が提供される。
【０００８】
【発明の実施の形態】
以下本発明をさらに詳細に説明する。
図１は本発明の記録体の代表例を表わしている。ここで１は平坦基板（以降単に「基板」ということがある）、２は記録層、３は微粒子である。この例では材料コストの安い平坦な基板を用い、コート液に予め微粒子を分散した液を塗布し、乾燥後表面に突出した微粒子３により記録層２表面を粗面にしている。最適な表面粗さ範囲（最大粗さ ８μｍ、平均面山高さ ４μｍ、平均面谷高さ ４μｍ）にするための微粒子径は体積平均粒径４μｍ以下で、好ましくは粒径０．５μｍ〜４μｍ、更に好ましくは１μｍ〜２μｍの範囲である。
【０００９】
基板１としては、ポリエチレンテレフタレート（ＰＥＴ）、ポリイミドなどの耐熱性フィルム；ゴムローラ、ゴムシートなどの弾性部材があげられる。微粒子３としては、分散重合又は乳化重合により重合した樹脂、シリカ等の無機材料があげられる。
【００１０】
記録層２の材料としては加熱状態でかつ液体と接触させたときに後退接触角が低下する記録層を設けたものである。ここでの“液体”は(1)液体の他に、(2)蒸気、(3)記録体における後退接触角の低下開始温度以下で液体となるか液体もしくは蒸気を発生する固体、であってもよい。蒸気は記録体表面又はその近傍が凝縮して液体に変化し、固体はそれから発生された蒸気が記録体表面又はその近傍が凝縮して液体を生じさせるからである。
【００１１】
記録層を構成する物質についての説明及びその具体例は特開平３−１７８４７８号公報に詳しく記載されている。中でも下記式で表わされる材料の使用が特に好ましい。
【化１】
微粒子含有記録層の形成には、記録層材料固形分を溶解又は分散したコート液に微粒子を分散し、これを基板上に塗布する。塗布方法は、ディップコート、グラビヤコート、ダイコート、スプレーコート、ワイヤーバーコート等が適当である。記録層２の厚みは３μｍ〜１０μｍ、好ましくは３μｍ〜４μｍである。記録層粗面化の程度の調整はコート液中の記録層固形分濃度、微粒子濃度、基板へのコート被膜厚みにより粗面度を調整する。おおよその目安として、記録層被膜厚みが３〜４μｍの範囲内では、コート液中の記録層材料固形分と微粒子の重量比は１／１〜１０／１が良く、好ましくは２／１〜５／１が良い。
【００１３】
上記の例では、コート液中の記録層材料及び微粒子の含有量やコート被膜厚みを調整して、記録層表面粗さを調整するようにしている。この方法は最も簡単な粗面度調整方法である。しかし、コート液塗布後の乾燥する時間内に塗布層中の微粒子が基板側に沈降するため、この沈降速度が環境条件により異なり被膜の表面粗度がばらつく恐れがある。そこで、塗布の信頼をあげるのが前記（２）の手段である。
【００１４】
即ち、図２のごとく、（ａ）予め微粒子を含有したコート液により記録層２１を形成し、被膜乾燥後に（ｂ）微粒子を含有しない記録層材料コート液にて被膜（記録層２２）を形成する。この時、微粒子を含有したコート液中の微粒子量は前記（１）に比べ高くする。この方法を用いれば、予め微粒子含有コート液による粗面記録層を形成時に表面粗度をチェックでき、その表面粗度に応じて記録層材料のみのコート条件を調整できるため信頼性が上がる。なお、これらのコートは一連のインライン処理とすればコート工程数が増えても製造コストの大幅な増加とならない。
【００１５】
微粒子を添加したコート液で記録層被膜を形成した後、その被膜上に微粒子を含まないコート液を塗工するには、微粒子を含むコート液で記録層被膜を形成した段階で、記録層表面をコロナ放電処理、電子線照射処理、又は紫外線処理を実施し、その後に微粒子を含まないコート液で記録層被膜をオーバーコートすると微粒子と記録層材料被膜との密着性が向上する。このことで、連続印字時に記録層突起部（微粒子存在部）の記録層被膜の剥離が防止できる。
【００１６】
ところで、記録体（液体と接触した状態で加熱すると後退接触角が低下する性質をもつ材料を記録層として有し、画像信号に応じて選択的に該記録層表面を加熱して潜像を書き込み、その潜像書き込み時又は後に、色材を含有したインクを接触させて該潜像を可視化する記録方法に利用されるものであって、該記録層中に体積平均粒子径が４μｍ以下の微粒子を含有する記録体）に画像書き込み手段としてサーマルヘッドを用いると、記録体とサーマルヘッドとの接触圧力が強い場合、記録層に含有した微粒子が硬質材料であると微粒子が研磨材として働き、サーマルヘッド面を傷つける恐れがある。また、記録層表面が粗面であるため、現像後記録体表面のインク層を記録紙に転写する場合、紙とインクとの接触不良による転写不足が生じる恐れがある。この問題を解決するためには、図３（ａ）に示したごとく、記録層２１に含有されている微粒子３１が弾性を有すればよい。図３（ｂ）のごとく、微粒子が弾性を有していれば、サーマルヘッドと記録層との接触時に記録層表面突起部は容易に変形し加重が分散するためサーマルヘッド表面を傷つけないし、また、同様に転写も記録層表面突起が変形するため記録紙４との接触性が改善される。
弾性微粒子３１の例としては、硬度４０度以下のウレタン材や中空のマイクロカプセル材が適当である。
【００１７】
記録体を連続印字に使用する場合には、微粒子含有記録層２１上の記録層２２被膜（記録層突起部）は突起部を有しているため常に強い加重をうける。このため、図４に示すごとく、突起部（微粒子）表面の記録層被膜が剥離する恐れがある。図中、５は記録層被膜の破損箇所を示している。そこで微粒子そのものを記録層材料とするか、微粒子として記録層材料が表面に形成された微粒子を用いるのが望ましい。これにより、微粒子３２と記録層被膜は同一材料となるため記録層表面突起部の被膜は剥離すことがなくなる（図５は微粒子が記録層材料と同じ組成の微粒子３２の例を表わしている）。
ここでの微粒子３２の代表例としては、含フッ素アクリレート又はフッ素メタクリレート系モノマーを乳化重合した後、自然乾燥した部材などの他、ポリメタクリレート系ポリマー微粒子表面に含フッ素メタクリレート又は含フッ素アクリレート系ポリマー被膜を形成した部材などがあげられる。
【００１８】
本発明の記録体を連続印字で使用する場合、微粒子含有記録体上の記録層被膜（記録層突起部）は突起部であるため常に強い加重をうけて剥離する恐れがある。また、記録層形成時に表層微粒子表面に記録層被膜が形成されない場合もある。そこで、微粒子そのものを撥インク性材料にすることも望ましい。図６のごとく記録層表層の微粒子表面に記録層被膜が存在しなくても、微粒子が撥インク性を示すと、現像時に地汚れが発生しない。但し、被膜がない部位は撥インク性を示すだけで画像が形成されないため、画像がかすれる恐れはあるが、画像がかすれるよりも地汚れが発生するほうが画質が悪い。従って、微粒子を撥インク性とすることは画質の信頼性向上に対して効果がある。
撥インク性微粒子３３の材料としては、主鎖にフッ素を有するフッ素材料（ポリテトラフルオロエチレン、テトラフルオロエチレン−ヘキサフロロポリプレン共重合体）が好ましい。
【００１９】
【実施例】
次に実施例をあげて本発明を具体的に説明する。
【００２０】
参考例１
記録体：記録層材料：含フッ素アクリレート系ポリマー（乳化重合にて作製）。
基板 ：厚さ２５μｍのＰＥＴフィルム。
微粒子：ポリメチルメタクリレート樹脂の微粒子（体積平均粒径２μｍ）。
コート液
組成：乳化重合した記録層材料原液（固形分２０ｗｔ％）に記録層材料／微 粒子＝２／１の比となるように微粒子を添加。
調製：ミリング処理により微粒子を十分に分散した。
コート方法：ワイヤーバーコート。
コート後乾燥：１２０℃５分間。
画像書き込み手段：４００ｄｐｉサーマルヘッド。
インク：市販水なし平板インキ（東洋インキ社製）。
親インク処理条件：接触液−水、温度−９０℃、時間５秒。
現像手段：ハンドローラにインク層を形成し、記録体に接触。
作製した記録体を親インク処理したのち、ネガポジ反転画像信号により書き込みを行った記録体をインクで現像したところ地汚れのない良好が画像が得られた。
【００２１】
実施例１
記録体：記録層材料：含フッ素アクリレート系ポリマー。
基板 ：厚さ２５μｍのＰＥＴフィルム。
微粒子：ポリメチルメタクリレート樹脂の体積平均粒径２μｍ微粒子。
（第一のコート液）
組成：乳化重合した記録層材料原液（固形分２０ｗｔ％）に記録層材料／微粒 子＝１／３の比となるように微粒子を添加。
作製：ミリング処理により微粒子を十分に分散した。
（第二のコート液）
組成：記録層材料固形分１０ｗｔ％．
コート方法：第一のコート、第二のコート何れもマイクログラビヤコート。
コート後乾燥：第一のコート−６０℃２秒、第二のコート−１２０℃５分間。
画像書き込み手段：４００ｄｐｉサーマルヘッド。
インク：市販水なし平板インキ（東洋インキ社製）。
親インク処理条件：接触液−水、温度−９０℃、時間５秒。
現像手段：ハンドローラにインク層を形成し、記録体に接触。
作製した記録体を親インク処理したのち、ネガポジ反転画像信号により書き込みを行った記録体をインクで現像したところ地汚れのない良好が画像が得られた。
【００２２】
実施例２
記録体：記録層材料：含フッ素アクリレート系ポリマー（乳化重合にて作製）。
基板 ：厚さ２５μｍのポリイミドフィルム。
微粒子：ポリメチルメタクリレート樹脂の微粒子（体積平均粒径２μｍ）。
（第一のコート液）
組成：乳化重合した記録層材料原液（固形分２０ｗｔ％）に記録層材料／微粒 子＝１／３の比となるように微粒子を添加。
作製：ミリング処理により微粒子を十分に分散した。
（第二のコート液）
組成：記録層材料固形分１０ｗｔ％。
コート方法：第一のコート、第二のコート何れもマイクログラビヤコート。
コート後乾燥：第一のコート−６０℃２秒、第二のコート−１２０℃５分間。
第一のコート後の表面処理手段：コロナ放電。
画像書き込み手段：４００ｄｐｉサーマルヘッド。
インク：市販水なし平板インキ（東洋インキ社製）。
親インク処理条件：接触液−水、温度−９０℃、時間５秒。
現像手段：ハンドローラにインク層を形成し、記録体に接触。
作製した記録体を親インク処理したのち、ネガポジ反転画像信号により書き込みを行った記録体をインクで現像したところ地汚れのない良好が画像が得られた。更に、現像及び紙への転写を１０００回繰り返したが、記録層被膜の剥離は認められなかった。
【００２３】
実施例３
記録体：記録層材料：含フッ素アクリレート系ポリマー（乳化重合にて作製）。
基板 ：厚さ２５μｍのＰＥＴフィルム。
微粒子：ゴム硬度４０度のウレタン微粒子（体積平均粒径４μｍ）。
コート液
組成：乳化重合した記録層材料原液（固形分２０ｗｔ％）に記録層材料／微粒 子＝５／１の比となるように微粒子を添加。
作製：ミリング処理により微粒子を十分に分散した。
コート方法：マイクログラビヤコート。
コート後乾燥：１２０℃５分間。
画像書き込み手段：４００ｄｐｉサーマルヘッド。
インク：市販水なし平板インキ（東洋インキ社製）。
親インク処理条件：接触液−水、温度−９０℃、時間５秒。
現像手段：ハンドローラにインク層を形成し、記録体に接触。
作製した記録体を親インク処理したのち、ネガポジ反転画像信号により書き込みを行った記録体をインクで現像したところ地汚れのない良好が画像が得られた。更に、紙に現像を行った記録体をインクで現像したところインクの紙への転移性が向上した。また、繰り返し書き込みによってサーマルヘッド熱素子表面に全く傷が発生しなかった。
【００２４】
参考例２
記録体：記録層材料：含フッ素アクリレート系ポリマー。
基板 ：厚さ２５μｍのポリイミドフィルム。
微粒子：含フッ素メタクリレート系モノマーを乳化重合し自然乾燥後乳鉢にて 粉砕したもの（体積平均粒径４μｍ）。
コート液
組成：乳化重合した記録層材料原液（固形分２０ｗｔ％）に記録層材料／微粒 子＝５／１の比となるように微粒子を添加。
作製：ミリング処理により微粒子を十分に分散した。
コート方法：マイクログラビヤコート。
コート後乾燥：１２０℃５分間。
画像書き込み手段：４００ｄｐｉサーマルヘッド。
インク：市販水なし平板インキ（東洋インキ社製）。
親インク処理条件：接触液−水、温度−９０℃、時間５秒。
現像手段：ハンドローラにインク層を形成し、記録体に接触。
作製した記録体を親インク処理したのち、ネガポジ反転画像信号により書き込みを行った記録体をインクで現像したところ、地汚れのない良好が画像が得られた。更に、現像及び紙への転写を１０００回繰り返したが、記録層被膜の剥離は認められなかった。
【００２５】
参考例３
記録体：記録層材料：含フッ素アクリレート系ポリマー。
基板 ：厚さ２５μｍのポリイミドフィルム。
微粒子：シリコーン樹脂微粒子（東芝シリコーン社製、トスパール１２）で体 積平均粒径２μｍのもの。
コート液
組成：乳化重合した記録層材料原液（固形分２０ｗｔ％）に記録層材料／微粒 子＝２／１の比となるように微粒子を添加。
作製：ミリング処理により微粒子を十分に分散した。
コート方法：マイクログラビヤコート。
コート後乾燥：１２０℃５分間。
画像書き込み手段：４００ｄｐｉサーマルヘッド。
インク：市販水なし平板インキ（東洋インキ製）。
親インク処理条件：接触液−水、温度−９０℃、時間５秒。
現像手段：ハンドローラにインク層を形成し、記録体に接触。
作製した記録体を親インク処理したのち、ネガポジ反転画像信号により書き込みを行った記録体をインクで現像したところ地汚れのない良好が画像が得られた。更に、現像及び紙への転写を１０００回繰り返し、記録層被膜の剥離が認められたものの地汚れは増大しなかった。
【００２６】
【発明の効果】
請求項１の発明によれば、記録装置の耐久性及び画質が向上する。
請求項２の発明によれば、最適粗面範囲となる記録体製造歩留まりが向上する。
請求項３の発明によれば、連続印字耐久性が向上する。
【図面の簡単な説明】
【図１】図１（ａ）は本発明の基本的な記録体を表わした図。
【図２】図２中（ａ）は第一のコート層が形成され、図２中（ｂ）はその上に第二のコート層が形成された状態を表わした図。
【図３】図３（ａ）は記録層中に弾性微粒子が埋め込まれた状態を表わした図、図３（ｂ）はこの記録層に記録紙が接触した状態を表わした図。
【図４】記録層被膜に破損が生じることを表した図。
【図５】記録層中の微粒子に記録層材料と同一組成のものを使用した図。
【図６】記録層中に撥インク性微粒子を含有させた図。
【図７】従来の記録体を表した図。
【符号の説明】
１ 平坦基板
１’ 粗面基板
２ 記録層（２１微粒子含有記録層、２２記録材料のみからなる記録層）
３ 微粒子（３１弾性微粒子、３２記録層被膜と同一材料からなる微粒子、３３撥インク性を有する微粒子）
４ 紙[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording medium, and more particularly, to a recording medium having a recording layer whose surface is appropriately roughened and which can obtain a latent image and a visible image satisfactorily.
[0002]
[Prior art]
A recording material having a recording layer made of a material having a property of decreasing the receding contact angle when heated in contact with a liquid, and a recording method using the same are described in detail in, for example, JP-A-3-178478.
In this type of recording medium, it is advantageous that the surface of the recording layer is appropriately roughened, since the ink can be uniformly attached to the required portions of the surface of the recording layer. Therefore, as shown in FIG. Next, it was considered to form the recording layer 2 on the rough substrate 1 '. However, in reality, the manufacturing cost for roughening the substrate is about 1.5 to 2 times higher than that of a normal substrate (for example, a PET transparent film (eg, S-10 manufactured by Toray)). .
[0003]
Therefore, the present inventors have proposed a number of techniques for roughening the surface of the recording layer. Among them, (1) adding a particulate antistatic agent to the recording layer (Japanese Patent Laid-Open No. 4-16385); Typical examples are (2) a crystalline polymer contained in the recording layer (Japanese Patent Application Laid-Open No. 4-163803), and (3) a filler added to the recording layer (Japanese Patent Application Laid-Open No. 4-163068). It is.
[0004]
[Problems to be solved by the invention]
However, the above-mentioned surface roughening technique has advantages and disadvantages, and further better surface roughening of the recording layer surface is required. Accordingly, an object of the present invention is to provide a recording medium having low production cost and moderate surface roughness.
[0005]
[Means for Solving the Problems]
That is, according to the present invention, (1) a material having a property that the receding contact angle is reduced when heated in contact with a liquid is provided as a recording layer, and the surface of the recording layer is selectively heated in accordance with an image signal. The latent image is written, and at the time of or after writing the latent image, is used for a recording method of visualizing the latent image by contacting an ink containing a coloring material, wherein the volume average particles in the recording layer There is provided a recording medium containing elastic fine particles having a diameter of 4 μm or less.
[0006]
According to the invention, (2) the recording layer has a material having a property that the receding contact angle is reduced when heated in contact with the liquid, and the recording layer surface is selectively heated in accordance with an image signal. A latent image is written, and at the time of or after writing the latent image, is used for a recording method of contacting an ink containing a coloring material to visualize the latent image, and a recording layer material and a volume average on a substrate. A recording medium is provided, wherein the recording medium has a layer in which a particle system has particles mixed with particles of 4 μm or less, and a layer of only a recording layer material containing no particles is provided on the layer in which the particles are mixed .
[0007]
Further according to the present invention, (3) pre-SL (2), after coating the recording layer forming solution containing fine particles, a corona discharge treatment, after film formation by electron beam irradiation or ultraviolet irradiation, containing the fine particles recording material is characterized in that a layer of only the recording layer material not containing fine particles is provided on the layer on.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in more detail.
FIG. 1 shows a representative example of the recording medium of the present invention. Here, 1 is a flat substrate (hereinafter sometimes simply referred to as “substrate”), 2 is a recording layer, and 3 is fine particles. In this example, a flat substrate having a low material cost is used, a liquid in which fine particles are dispersed in a coating liquid is applied in advance, and after drying, the surface of the recording layer 2 is roughened by the fine particles 3 protruding from the surface. The fine particle diameter for the optimal surface roughness range (maximum roughness 8 μm, average surface peak height 4 μm, average surface valley height 4 μm) is a volume average particle diameter of 4 μm or less, preferably 0.5 μm to 4 μm, More preferably, it is in the range of 1 μm to 2 μm.
[0009]
Examples of the substrate 1 include a heat-resistant film such as polyethylene terephthalate (PET) and polyimide; and an elastic member such as a rubber roller and a rubber sheet. Examples of the fine particles 3 include resins polymerized by dispersion polymerization or emulsion polymerization, and inorganic materials such as silica.
[0010]
The recording layer 2 is provided with a recording layer in which the receding contact angle decreases when the recording layer 2 is brought into contact with a liquid in a heated state. The “liquid” here is (1) a liquid, (2) a vapor, and (3) a liquid or a solid that generates a liquid or a vapor at or below a temperature at which the receding contact angle of a recording medium begins to decrease. Is also good. This is because the vapor condenses on the surface of the recording medium or in the vicinity thereof to turn into a liquid, and the solid generated from the vapor condenses on the surface of the recording medium or in the vicinity thereof to produce a liquid.
[0011]
The description of the material constituting the recording layer and specific examples thereof are described in detail in JP-A-3-178478. Among them, the use of a material represented by the following formula is particularly preferred.
Embedded image
To form the fine particle-containing recording layer, fine particles are dispersed in a coating solution in which the solid content of the recording layer material is dissolved or dispersed, and this is applied onto a substrate. Appropriate coating methods include dip coating, gravure coating, die coating, spray coating, and wire bar coating. The thickness of the recording layer 2 is 3 μm to 10 μm, preferably 3 μm to 4 μm. The degree of surface roughening of the recording layer is adjusted by adjusting the solid concentration of the recording layer in the coating solution, the concentration of fine particles, and the thickness of the coating film on the substrate. As a rough guide, when the coating thickness of the recording layer is in the range of 3 to 4 μm, the weight ratio of the solid content of the recording layer material to the fine particles in the coating liquid is preferably 1/1 to 10/1, preferably 2/1 to 5/1. / 1 is good.
[0013]
In the above example, the recording layer surface roughness is adjusted by adjusting the content of the recording layer material and the fine particles in the coating liquid and the thickness of the coating film. This method is the simplest method of adjusting the roughness. However, since the fine particles in the coating layer settle on the substrate side during the drying time after the coating liquid is applied, the sedimentation speed varies depending on environmental conditions, and the surface roughness of the coating may vary. Therefore, the means (2) above enhances the reliability of coating.
[0014]
That is, as shown in FIG. 2, (a) the recording layer 21 is formed by a coating liquid containing fine particles in advance, and after the coating is dried, (b) a coating (recording layer 22) is formed by a coating liquid for the recording layer material containing no fine particles. I do. At this time, the amount of the fine particles in the coating liquid containing the fine particles is higher than that in the above (1). When this method is used, the surface roughness can be checked in advance when forming a rough recording layer using a coating liquid containing fine particles, and the coating conditions of only the recording layer material can be adjusted according to the surface roughness, thereby increasing reliability. If these coats are formed as a series of in-line treatments, the production cost does not increase significantly even if the number of coating steps increases.
[0015]
After forming the recording layer coating with the coating liquid to which the fine particles are added, and then applying the coating liquid containing no fine particles on the coating, the recording layer surface is formed at the stage of forming the recording layer coating with the coating liquid containing the fine particles. Is subjected to a corona discharge treatment, an electron beam irradiation treatment, or an ultraviolet treatment, and then the recording layer coating is overcoated with a coating solution containing no fine particles, whereby the adhesion between the fine particles and the recording layer material coating is improved. This can prevent peeling of the recording layer coating on the recording layer protrusions (parts where fine particles exist) during continuous printing.
[0016]
By the way, a recording material (a material having a property that a receding contact angle is reduced when heated in contact with a liquid) is used as a recording layer, and a latent image is written by selectively heating the surface of the recording layer in accordance with an image signal. At the time of or after writing the latent image, a method of making the latent image visible by contacting an ink containing a coloring material, wherein fine particles having a volume average particle diameter of 4 μm or less in the recording layer When a thermal head is used as an image writing means for a recording medium containing fine particles, when the contact pressure between the recording medium and the thermal head is strong, if the fine particles contained in the recording layer are hard materials, the fine particles act as an abrasive, The head surface may be damaged. In addition, since the surface of the recording layer is rough, when the ink layer on the surface of the recording medium is transferred to recording paper after development, insufficient transfer may occur due to poor contact between the paper and the ink. In order to solve this problem, the fine particles 31 contained in the recording layer 21 may have elasticity as shown in FIG. As shown in FIG. 3B, if the fine particles have elasticity, the projections on the recording layer surface are easily deformed when the thermal head comes into contact with the recording layer, and the load is dispersed, so that the thermal head surface is not damaged, and Similarly, in the transfer, the surface protrusions of the recording layer are deformed, so that the contact with the recording paper 4 is improved.
As an example of the elastic fine particles 31, a urethane material having a hardness of 40 degrees or less or a hollow microcapsule material is appropriate.
[0017]
When the recording medium is used for continuous printing, the coating (recording layer projection) on the recording layer 22 on the fine particle-containing recording layer 21 always has a strong load because it has a projection. For this reason, as shown in FIG. 4, there is a possibility that the recording layer coating on the surface of the projection (fine particles) may peel off. In the figure, reference numeral 5 denotes a damaged portion of the recording layer coating. Therefore, it is desirable to use the fine particles themselves as the recording layer material, or to use the fine particles having the recording layer material formed on the surface as the fine particles. As a result, the fine particles 32 and the recording layer coating are made of the same material, so that the coating on the recording layer surface projections does not peel off (FIG. 5 shows an example of the fine particles 32 having the same composition as the recording layer material). .
Typical examples of the fine particles 32 here include, after emulsion polymerization of a fluorinated acrylate or fluorinated methacrylate-based monomer, a naturally dried member or the like, and a fluorinated methacrylate or fluorinated acrylate-based polymer coating on the surface of polymethacrylate-based polymer fine particles. And the like.
[0018]
When the recording medium of the present invention is used for continuous printing, the recording layer coating (recording layer projections) on the fine particle-containing recording medium is a projection, so that it may always be peeled off under a strong load. In some cases, the recording layer coating is not formed on the surface of the surface fine particles when the recording layer is formed. Therefore, it is also desirable to use the fine particles themselves as an ink-repellent material. Even if there is no recording layer coating on the surface of the fine particles on the surface of the recording layer as shown in FIG. 6, if the fine particles show ink repellency, no background stain occurs during development. However, since a portion having no coating only shows ink repellency and does not form an image, there is a possibility that the image will be blurred. However, the image quality is worse when background contamination occurs than when the image is blurred. Therefore, making the fine particles ink-repellent is effective for improving the reliability of image quality.
As the material of the ink-repellent fine particles 33, a fluorine material (polytetrafluoroethylene, tetrafluoroethylene-hexafluoropolypropylene copolymer) having fluorine in the main chain is preferable.
[0019]
【Example】
Next, the present invention will be described specifically with reference to examples.
[0020]
Reference Example 1
Recording medium: Recording layer material : Fluorine-containing acrylate polymer (prepared by emulsion polymerization).
Substrate: PET film having a thickness of 25 μm.
Fine particles: fine particles of polymethyl methacrylate resin (volume average particle size 2 μm).
Coating liquid composition: Fine particles were added to an emulsion-polymerized recording layer material stock solution (solid content: 20 wt%) so that the ratio of recording layer material / fine particles was 2/1.
Preparation: Fine particles were sufficiently dispersed by a milling treatment.
Coating method: wire bar coating.
Drying after coating: 120 ° C. for 5 minutes.
Image writing means: 400 dpi thermal head.
Ink: Commercially available waterless flat ink (manufactured by Toyo Ink Co., Ltd.).
Ink-philic treatment conditions: contact liquid-water, temperature-90 ° C, time 5 seconds.
Developing means: forming an ink layer on a hand roller and contacting the recording medium.
After the prepared recording medium was subjected to the ink-philic treatment, the recording medium on which the writing was performed with the negative / positive reversal image signal was developed with the ink.
[0021]
Example 1
Recording medium: recording layer material : fluorine-containing acrylate polymer.
Substrate: PET film having a thickness of 25 μm.
Fine particles: fine particles having a volume average particle diameter of 2 μm of polymethyl methacrylate resin.
(First coating liquid)
Composition: Fine particles were added to the emulsion-polymerized recording layer material stock solution (solid content 20 wt%) so that the ratio of recording layer material / fine particles was 1/3.
Production: Fine particles were sufficiently dispersed by milling.
(Second coating liquid)
Composition: recording layer material solid content 10 wt%.
Coating method: Both the first coat and the second coat are microgravure coats.
Drying after coating: first coat-60 ° C for 2 seconds, second coat-120 ° C for 5 minutes.
Image writing means: 400 dpi thermal head.
Ink: Commercially available waterless flat ink (manufactured by Toyo Ink Co., Ltd.).
Ink-philic treatment conditions: contact liquid-water, temperature-90 ° C, time 5 seconds.
Developing means: forming an ink layer on a hand roller and contacting the recording medium.
After the prepared recording medium was subjected to the ink-philic treatment, the recording medium on which the writing was performed with the negative / positive reversal image signal was developed with the ink.
[0022]
Example 2
Recording medium: Recording layer material : Fluorine-containing acrylate polymer (prepared by emulsion polymerization).
Substrate: 25 μm thick polyimide film.
Fine particles: fine particles of polymethyl methacrylate resin (volume average particle size 2 μm).
(First coating liquid)
Composition: Fine particles were added to the emulsion-polymerized recording layer material stock solution (solid content 20 wt%) so that the ratio of recording layer material / fine particles was 1/3.
Production: Fine particles were sufficiently dispersed by milling.
(Second coating liquid)
Composition: recording layer material solids 10 wt%.
Coating method: Both the first coat and the second coat are microgravure coats.
Drying after coating: first coat-60 ° C for 2 seconds, second coat-120 ° C for 5 minutes.
Surface treatment means after the first coating: corona discharge.
Image writing means: 400 dpi thermal head.
Ink: Commercially available waterless flat ink (manufactured by Toyo Ink Co., Ltd.).
Ink-philic treatment conditions: contact liquid-water, temperature-90 ° C, time 5 seconds.
Developing means: forming an ink layer on a hand roller and contacting the recording medium.
After the prepared recording medium was subjected to the ink-philic treatment, the recording medium on which the writing was performed with the negative / positive reversal image signal was developed with the ink. Further, development and transfer to paper were repeated 1,000 times, but no peeling of the recording layer coating was observed.
[0023]
Example 3
Recording medium: Recording layer material : Fluorine-containing acrylate polymer (prepared by emulsion polymerization).
Substrate: PET film having a thickness of 25 μm.
Fine particles: urethane fine particles having a rubber hardness of 40 degrees (volume average particle diameter 4 μm).
Coating liquid composition: Fine particles were added to the emulsion-polymerized recording layer material stock solution (solid content 20 wt%) so that the ratio of recording layer material / microparticles was 5/1.
Production: Fine particles were sufficiently dispersed by milling.
Coating method: Micro gravure coat.
Drying after coating: 120 ° C. for 5 minutes.
Image writing means: 400 dpi thermal head.
Ink: Commercially available waterless flat ink (manufactured by Toyo Ink Co., Ltd.).
Ink-philic treatment conditions: contact liquid-water, temperature-90 ° C, time 5 seconds.
Developing means: forming an ink layer on a hand roller and contacting the recording medium.
After the prepared recording medium was subjected to the ink-philic treatment, the recording medium on which the writing was performed with the negative / positive reversal image signal was developed with the ink. Further, when the recording medium developed on paper was developed with ink, the transferability of the ink to paper was improved. Further, no scratch was generated on the surface of the thermal head thermal element by repeated writing.
[0024]
Reference Example 2
Recording medium: recording layer material : fluorine-containing acrylate polymer.
Substrate: 25 μm thick polyimide film.
Fine particles: fluorinated methacrylate-based monomers are emulsion-polymerized, air-dried, and then pulverized in a mortar (volume average particle size: 4 μm).
Coating liquid composition: Fine particles were added to the emulsion-polymerized recording layer material stock solution (solid content 20 wt%) so that the ratio of recording layer material / microparticles was 5/1.
Production: Fine particles were sufficiently dispersed by milling.
Coating method: Micro gravure coat.
Drying after coating: 120 ° C. for 5 minutes.
Image writing means: 400 dpi thermal head.
Ink: Commercially available waterless flat ink (manufactured by Toyo Ink Co., Ltd.).
Ink-philic treatment conditions: contact liquid-water, temperature-90 ° C, time 5 seconds.
Developing means: forming an ink layer on a hand roller and contacting the recording medium.
After the prepared recording medium was subjected to the ink-affinity treatment, the recording medium on which the writing was performed by the negative / positive reversal image signal was developed with ink. As a result, good images without background contamination were obtained. Further, development and transfer to paper were repeated 1,000 times, but no peeling of the recording layer coating was observed.
[0025]
Reference Example 3
Recording medium: recording layer material : fluorine-containing acrylate polymer.
Substrate: 25 μm thick polyimide film.
Fine particles: Silicone resin fine particles (Tospearl 12 manufactured by Toshiba Silicone Co., Ltd.) having a volume average particle size of 2 μm.
Coating liquid composition: Fine particles were added to an emulsion-polymerized recording layer material stock solution (solid content 20 wt%) so that the ratio of recording layer material / fine particles was 2/1.
Production: Fine particles were sufficiently dispersed by milling.
Coating method: Micro gravure coat.
Drying after coating: 120 ° C. for 5 minutes.
Image writing means: 400 dpi thermal head.
Ink: Commercially available flat ink without water (manufactured by Toyo Ink).
Ink-philic treatment conditions: contact liquid-water, temperature-90 ° C, time 5 seconds.
Developing means: forming an ink layer on a hand roller and contacting the recording medium.
After the prepared recording medium was subjected to the ink-philic treatment, the recording medium written with the negative-positive reversal image signal was developed with the ink, and a good image without background smear was obtained. Further, development and transfer to paper were repeated 1,000 times, and peeling of the recording layer coating was observed, but background contamination did not increase.
[0026]
【The invention's effect】
According to the first aspect of the invention, the durability and the image quality of the recording apparatus are improved.
According to the second aspect of the present invention, the production yield of the recording medium having the optimum rough surface range is improved.
According to the invention of claim 3, improved continuous printing durability.
[Brief description of the drawings]
1] Fig. 1 (a) showing the basic recording medium of the present invention FIG.
2A is a diagram illustrating a state in which a first coat layer is formed, and FIG. 2B is a diagram illustrating a state in which a second coat layer is formed thereon.
3A is a diagram illustrating a state in which elastic fine particles are embedded in a recording layer, and FIG. 3B is a diagram illustrating a state in which recording paper is in contact with the recording layer.
FIG. 4 is a diagram showing that a recording layer coating is damaged.
FIG. 5 is a view in which fine particles in the recording layer have the same composition as the material of the recording layer.
FIG. 6 is a diagram in which ink-repellent fine particles are contained in a recording layer.
FIG. 7 is a diagram showing a conventional recording medium.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flat substrate 1 'Rough surface substrate 2 Recording layer (21 fine particle containing recording layer, 22 recording layer consisting only of recording material)
3 Fine particles (31 elastic fine particles, 32 fine particles made of the same material as the recording layer coating, 33 fine particles having ink repellency)
4 paper
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27155196A JP3557054B2 (en) | 1996-09-20 | 1996-09-20 | Recorded body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27155196A JP3557054B2 (en) | 1996-09-20 | 1996-09-20 | Recorded body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1095167A JPH1095167A (en) | 1998-04-14 |
| JP3557054B2 true JP3557054B2 (en) | 2004-08-25 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27155196A Expired - Fee Related JP3557054B2 (en) | 1996-09-20 | 1996-09-20 | Recorded body |
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| Country | Link |
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| JP (1) | JP3557054B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3877460B2 (en) | 1999-03-02 | 2007-02-07 | 株式会社リコー | Image recording medium |
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1996
- 1996-09-20 JP JP27155196A patent/JP3557054B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| JPH1095167A (en) | 1998-04-14 |
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