JP3226167B2 - Image receiving sheet for thermal transfer recording - Google Patents
Image receiving sheet for thermal transfer recordingInfo
- Publication number
- JP3226167B2 JP3226167B2 JP02475399A JP2475399A JP3226167B2 JP 3226167 B2 JP3226167 B2 JP 3226167B2 JP 02475399 A JP02475399 A JP 02475399A JP 2475399 A JP2475399 A JP 2475399A JP 3226167 B2 JP3226167 B2 JP 3226167B2
- Authority
- JP
- Japan
- Prior art keywords
- image
- receiving sheet
- layer
- thermal transfer
- image receiving
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/32—Thermal receivers
Landscapes
- Thermal Transfer Or Thermal Recording In General (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は画像信号に応じてサ
ーマルヘッド等の熱により熱転写シートの昇華性染料等
を移行させて記録を行うのに適した熱転写記録用受像シ
ートに関する。
【０００２】
【従来の技術】昇華性染料等の転写を受ける熱転写記録
用受像シートとしては、熱可塑性ポリエステル樹脂等を
バインダーとし、微粉末シリカや炭酸カルシウム等を混
合分散させた塗工液を、上質紙等の紙基材等に塗布して
受像層を形成したものが知られている。しかしながら、
階調性のある画像を転写する場合、上質紙のような平滑
度の低い基材に受像層を設けても、転写抜けのない、美
しい階調性のある画像は得られない。特に、受像層が有
機溶剤溶液を用いて形成される場合には、画像の転写抜
けが多い。
【０００３】一般に記号や文字、数字等の画像を転写す
る時には、無地の部分が多いので転写抜けは記号や文
字、数字の部分に生じない限り目立たないが、写真のよ
うな画像や、ベタ着色部のある画像では転写抜けは欠点
として残る。この欠点を改善する為、過去、様々な努力
がなされてきた。
【０００４】例えば、(1) 特開昭６１−１７２７９５号
には受像層の下の中間層に有機溶剤バリヤー性を持た
せ、且つＪＩＳ Ｂ０６０１に準じて測定される表面の
最大高さＲmax を７ミクロン以下にする方法か提案され
ており、(2) 特開昭６１−１４４３９４号には樹脂を主
とする中間層のＪＩＳ Ｋ６３０１で規定される１００
％モジュラスを１００ｋｇ／ｃｍ2 以下とする方法か提
案されている。
【０００５】しかし、改良に伴って新たな間題が付随す
るため、必ずしも満足すべき結果が得られていないのが
現状である。例えば、上記(1) では中間層が可塑性を保
持している間に鏡面接触させて加熱乾燥する工程等があ
るが、生産速度が著しく低下するという問題があり、
(2) ではクッション性を付与する目的で配合した中間層
中の柔軟な樹脂が、塗布乾燥後の巻取り仕上げでブロッ
キングを起こし易いという間題が付随する。さらに、こ
れ等の方法によって転写抜けはかなり改善されるが、記
録像の転写濃度は未だ不充分な状況にある。
【０００６】
【発明が解決しようとする課題】本発明は上記の如き間
題を付随することなく、転写抜けのない高濃度で美しい
記録画像を与える熱転写記録用受像シートを効率良く提
供するものである。紙等の基材に予め表面平滑性の良い
中間層を設け、この上に受像層を形成すると、転写抜け
は改善されるものの、中間層の材質によっては転写濃度
が大きく変動する恐れがある。従来から、中間層に中空
の粒子を用いると断熱効果が生じ、転写濃度の改善に有
効であることが知られている。しかし、併用される樹脂
や接着剤等の種類によっては反対に転写濃度が低下する
等の問題がある。
【０００７】
【課題を解決するための手段】本発明者等は、中間層の
構成について鋭意研究を進めた結果、中空の粒子と耐有
機溶剤性の高分子を主成分とする層として中間層を構成
すると受像シートにおける転写濃度が著しく改善される
ことを見出し本発明を完成するに至った。
【０００８】本発明は基材上に中間層、受像層を順次設
けた熱転写記録用受像シートにおいて、該中間層が、熱
膨張性の可塑性物質を熱膨張させて得られる粒子径０．
１〜１００μｍの中空の粒子、あるいは粒子径０．１〜
２０μｍのマイクロカプセル状の中空ポリマーの中空の
粒子と、耐有機溶剤性の高分子を主成分とする層で構成
されていることを特徴とする熱転写記録用受像シートで
ある。
【０００９】
【発明の実施の形態】本発明において中間層の主成分と
して好ましく用いられる中空の粒子としては、例えば下
記の如き物質か挙げられる。
（１） 熱膨張性の可塑性物質
塩化ビニリデンーアクリロニトリル共重合体等の熱可塑
性物質をカプセル壁とする中空の粒子で、粒子内部にプ
ロパン、ｎ−ブタン、イソブタン等の揮発性の膨張剤を
含有する物質。
（具体例）：松本油脂社製；マツモトマイクロフェアー
Ｆ３０：ケマノーベル社製；Ｅｘｐａｎｃｅｌ ５５
１；６４２
【００１０】（２） マイクロカプセル状の中空ポリマ
ー
アクリル−スチレン共重合体等の硬い樹脂を殻とし、内
部に水が入っており、乾燥時に水が飛び出して中空とな
るポリマー。
（具体例）：Ｒｏｈｍ＆Ｈａａｓ社製；ローペイクＯＰ
−８４Ｊ
【００１１】上記の如き中空の粒子は一般に０．１〜２
００μｍ程度の粒子径を有しているが、本発明において
は、０．１〜２０μｍ程度の粒子径を有する中空の粒子
が使用可能である。０．１μｍ未満では中空の粒子とし
ての充分な断熱効果か得られず、２０μｍを越えると受
像層の平滑性が低下し所望の効果を得ることができな
い。しかし、熱膨張性の可塑性物質を熱膨張させて得ら
れた中空の粒子はクッション性があり、柔軟性に富むた
め１００μｍ以下であれば使用可能である。
【００１２】本発明の受像シートにおいて、上記の如き
中空の粒子は中間層を構成する必須の成分として使用さ
れるが、いずれも受像層の有機溶剤、例えばメチルエチ
ルケトン等に溶解するため、耐有機溶剤性の高分子を中
空の粒子の接着剤として使用するか、あるいは中空の粒
子を含む層の上に耐有機溶剤性の高分子層を設けるなど
して中間層に充分な耐有機溶剤性を付与する必要があ
る。
【００１３】耐有機溶剤性の高分子としては、フィルム
形成能に優れ、しかも有機溶剤の浸透を抑制できる高分
子が好ましく、具体的には例えばポリビニルアルコー
ル、カゼイン、澱粉等の親水性高分子やアクリル酸エス
テル、エチレン−酢酸ビニル共重合体、カルボキシル基
を有するポリエチレン等が挙げられる。なかでも、ポリ
ビニルアルコール、カゼイン、澱粉は本発明の所望の効
果において優れているため最も好ましく用いられる。
【００１４】上記の如く、本発明の中間層は中空の粒子
と耐有機溶剤性の高分子を主成分とする層として構成さ
れるが、一層の形で構成する場合には、一般に中空の粒
子を耐有機溶剤性の高分子を接着剤として基材に塗布す
る方法によって構成される。また中空の粒子を含む層の
上に耐有機溶剤性の高分子層を設ける場合には、中空の
粒子を耐有機溶剤性の高分子若しくは他の接着荊と共に
基材に塗布して下層を形成した後に、上層に耐有機溶剤
性の高分子を主成分とするバリヤー層を設ける方法で一
般に構成される。
【００１５】中間層の塗布量は中空の粒子が熱膨張性の
可塑性物質の場合には１〜１０ｇ／ｍ2 程度、好ましく
は２〜６ｇ／ｍ2 程度の範囲で調整され、中空の粒子が
中空ポリマーの場合には５〜５０ｇ／ｍ2 程度、好まし
くは１０〜３０ｇ／ｍ2 程度塗布される。なお、中間層
を二層で構成する場合の耐有機溶剤性高分子を主成分と
する上塗り層は２ｇ／ｍ2 程度以上塗布するのが望まし
い。
【００１６】中間層には中空の粒子の断熱性及びクッシ
ョン性、さらには耐有機溶剤性高分子のバリヤー性を損
なわない範囲でカオリン、炭酸カルシュウム、酸化チタ
ン等の顔料、滑剤、蛍光染料等の各種助剤を適宜添加す
ることができる。また、受像シートを構成する基材とし
ては、例えば合成紙、上質紙、アート紙、コート紙、キ
ャスト紙、高分子フィルム等が適宜使用される。また、
これらの材料を２種以上貼合わせた複合基材も使用され
る。
【００１７】受像層は例えばポリエステル、ポリアミ
ド、アクリル樹脂、アセテート樹脂、ポリスチレン樹
脂、塩化ビニル／酢酸ビニル共重合体樹脂等の極性基を
有する樹脂を単独若しくは２種以上混合したものをトル
エン、ベンゼン、キシレン、メチルエチルケトン等の有
機溶剤に溶解した溶液を乾燥重量で２〜１０ｇ／ｍ2 程
度になるように塗布して形成される。さらに必要に応じ
て基材の裏面にカール防止及び給紙適性付与のため合成
樹脂または顔料及び接着剤等から成るコート層を適宜設
けてもよい。
【００１８】なお、受像シートの外観や平滑性向上の目
的で中間層を塗布、乾燥後若しくは受像層を設けた後で
スーパーカレンダー等の加圧装置により平滑化処理を行
うこともできる。また、必要に応じて受像シートの表面
或いは裏面に界面活性剤等による帯電防止処理を施すこ
ともできる。
【００１９】
【実施例】以下に、本発明をより具体的に説明するため
に実施例を記載するが、勿論これらに限定されるもので
はない。なお、例中の部は重量部を示す。
【００２０】参考例１
米坪１０１ｇ／ｍ2 の上質紙に殻壁の軟化点温度８０〜
８５℃の熱膨張性の可塑性物質一マツモトマイクロスフ
ェアーＦ−３０（松本油脂Ｋ．Ｋ製）を７０部及び汎用
のＳＢＲ３０部より成る中間層の下層を乾燥重量で３．
５ｇ／ｍ2 になるように塗布し、１２０℃で１分間乾燥
した。この熱乾燥により該熱膨張性の可塑性物質は体積
で３０〜７０倍に膨張した。該中間層の上層としてポリ
ビニルアルコールを乾燥重量で３．５ｇ／ｍ2 を塗布
し、さらにその上に下記組成の受像層を乾燥重量で４ｇ
／ｍ2 になるように塗布し、１２０℃で５分間乾燥して
受像シートを得た。
【００２１】
受像層組成
ポリエステル樹脂：Ｖｙｌｏｎ ２００（東洋紡） ・・・１．０部
アミノ変性シリコーンＫＦ−３９３（信越化学工業） ・・・０．０３部
エポキシ変性シリコーン：Ｘ−２２−３４３（信越化学工業）
・・・０．０３部
メチルエチルケトン／トルエン／シクロヘキサン（重量比４：４：２）
・・・９．０部
【００２２】次いで、下記組成の熱転写層形成用インキ
組成物を調製し、裏面に耐熱処理を施した９ミクロン厚
のＰＥＴフィルムに乾燥重量で１．０ｇ／ｍ2 になるよ
うに塗布、乾燥して転写シートを得た。
熱転写層形成用インキ組成
分散染料：ＫＳＴ−Ｂ−７１４（日本化薬） ・・・０．４５部
ポリビニルブチラール：ＢＸ−１（積水化学工業） ・・・０．４部
メチルエチルケトン／トルエン（重量比１：１） ・・・９．２部
【００２３】上記で得られた転写シート及び受像シート
を組み合わせてサーマルヘッドにより、エネルギー密度
７０ｍＪ／ｍｍ2 、パルス巾１０ｍｓｅｃ、ドット密度
６ドット／ｍｍの条件で印字した。印字テストの結果、
転写抜けがなく且つ転写濃度の極めて高い画像を得た。
【００２４】実施例１
中間層を熱膨張性の可塑性物質−マツモトマイクロスフ
ェアーＦ−３０を７０部とポリビニルアルコールの３０
部からなる一層をもって構成した以外は全て参考例１と
同様に行った。印字テストの結果、転写抜けがなく且つ
転写濃度の極めて高い画像が得られた。
【００２５】実施例２
実施例１で得た受像シートを熱スーパーカレンダーで加
熱、加圧平滑化処理を行った。この処理により、受像シ
ートの厚みが１６５ミクロンから１１０ミクロンに減少
した。その他は参考例１と同様に行った。印字テストの
結果、転写抜けの全然ない、転写濃度の高い画像が得ら
れた。
【００２６】実施例３
実施例１で得た受像シートの裏面に汎用のＳＢＲ７０
部、炭酸カルシウム３０部、ポリエチレンワックス２部
よりなる裏面コート層を乾燥重量で１０ｇ／ｍ2になる
ように塗布した他は参考例１と同様に行った。印字テス
トの結果、転写抜けの全然ない、転写濃度の高い画像が
得られた。また、３０℃、ＲＨ１０％の低湿度下および
４０℃、ＲＨ９０％の高湿度下に各々１２時間以上放置
してもカールは殆ど発生しなかった。
【００２７】実施例４
厚さ１００ミクロンの白色ポリエチレンテレフタレート
（ＰＥＴ）フィルムを基材とした他は全て実施例１と同
様に行った。印字テストの結果、転写抜けがなく且つ転
写濃度の極めて高い画像が得られた。
【００２８】実施例５
実施例４で得た受像シートを熱スーパーカレンダーで加
熱、加圧平滑化処理を行った。この処理により、厚さが
１４５ミクロンから１２３ミクロンになった。その他は
参考例１と同様に行った。印字テストの結果、転写抜け
が全然な区且つ転写濃度の高い画像が得られた。
【００２９】参考例２
参考例１において、中間層の下層として中空ポリマー・
ローペイクＯＰ−８４Ｊ（Ｒｏｈｍ ＆ Ｈａａｓ社
製）８０部、汎用のＳＢＲ２０部よりなる組成物を乾燥
重量で２０ｇ／ｍ2 になるように塗布した以外は全て参
考例１と同様に行った。印字テストの結果、参考例１と
同様に転写抜けがなく且つ転写濃度の高い画像が得られ
た。
【００３０】比較例１
参考例１における中間層の上層を設けずに、下層を形成
させた後直接受像層を塗布したところ、受像層の溶剤が
基材にまで滲み込み裏抜けを起こした。参考例１と同様
に印字テストを行った結果、転写濃度が低く、自い斑点
状の転写抜けが多発した。また、受像層塗布前後の紙厚
を測定したところ、紙厚が１６０ミクロンから１３５ミ
クロンに減少しており、中間層の下層か受像層の有機溶
剤で溶解したことは明らかである。
【００３１】比較例２
中間層を平均粒子径４０ミクロンの中空の粒子−マツモ
トマイクロスフェアーＭ６００（松本油脂Ｋ．Ｋ製）を
７０部とポリビニルアルコール３０部から成る一層で形
成したことの他は全て参考例１と同様に行った。印字テ
ストの結果、転写抜けが多く且つ転写濃度も低下した。
【００３２】比較例３
参考例２における中間層の上層を設けずに、下層を形成
させた後直接に受像層を塗布した。参考例１と同様に印
字テストを行った結果、転写抜けが多く且つ転写濃度の
低い画像が得られた。
【００３３】
【発明の効果】本発明の実施例で得られた受像シートは
いずれも転写抜けがなく且つ転写濃度の高い、美しい画
像を得ることができた。なお、実施例２及び実施例５の
ように、中間層が熱膨張性の可塑性物質を熱膨張させた
ものを含有する場合に、中間層を形成させた後に熱スー
パーカレンダーで平滑化処理を行い、該熱膨張性粒子が
実質上フィルム状に近い状態まで潰れても転写抜けがな
く、且つ転写濃度の高い画像を得ることができた。な
お、基材がポリオレフィン系合成紙若しくは高分子フィ
ルムであるときは、中間層の断熱効果により、印字の際
の基材の熱収縮に起因する受像シートのカールが防止で
きた。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to thermal transfer suitable for performing recording by transferring a sublimable dye or the like on a thermal transfer sheet by heat of a thermal head or the like in accordance with an image signal. The present invention relates to a recording image receiving sheet. 2. Description of the Related Art As an image receiving sheet for thermal transfer recording which receives a transfer of a sublimable dye or the like, a coating liquid in which thermoplastic polyester resin or the like is used as a binder and fine powder silica or calcium carbonate is mixed and dispersed is used. There has been known an image receiving layer formed by coating a paper base material such as high quality paper or the like. However,
When transferring an image with gradation, even if the image receiving layer is provided on a low-smoothness base material such as high-quality paper, an image with beautiful gradation without transfer omission cannot be obtained. In particular, when the image receiving layer is formed by using an organic solvent solution, image transfer omission often occurs. In general, when transferring images such as symbols, characters, and numbers, there are many solid portions, so the transfer omission is inconspicuous unless it occurs in the portions of symbols, characters, and numbers. In an image having a part, the transfer omission remains as a defect. Various efforts have been made in the past to remedy this drawback. For example, (1) JP-A-61-272795 discloses that an intermediate layer below an image receiving layer is provided with an organic solvent barrier property, and the maximum height R max of a surface measured according to JIS B0601 is specified. A method of reducing the thickness to 7 microns or less has been proposed.
A method for reducing the% modulus to 100 kg / cm 2 or less has been proposed. However, at present, satisfactory results have not always been obtained because new problems accompany the improvements. For example, in the above (1), there is a step of heating and drying by making mirror contact while the intermediate layer retains plasticity, but there is a problem that the production rate is significantly reduced,
In the case of (2), there is a problem that the soft resin in the intermediate layer blended for the purpose of imparting the cushioning property easily causes blocking in the winding finish after coating and drying. Furthermore, although transfer omission is considerably improved by these methods, the transfer density of a recorded image is still insufficient. SUMMARY OF THE INVENTION The present invention efficiently provides an image-receiving sheet for thermal transfer recording which provides a high-density and beautiful recorded image without transfer omission without accompanying the above-mentioned problems. is there. If an intermediate layer having good surface smoothness is provided in advance on a base material such as paper, and an image receiving layer is formed thereon, transfer omission is improved, but the transfer density may greatly vary depending on the material of the intermediate layer. Conventionally, it has been known that the use of hollow particles in the intermediate layer has a heat insulating effect and is effective in improving the transfer density. However, depending on the type of resin, adhesive or the like used in combination, there is a problem such as a decrease in transfer density. The inventors of the present invention have conducted intensive studies on the structure of the intermediate layer, and as a result, the intermediate layer was formed as a layer mainly composed of hollow particles and an organic solvent-resistant polymer. Was found to significantly improve the transfer density on the image receiving sheet, and completed the present invention. According to the present invention, there is provided an image receiving sheet for thermal transfer recording wherein an intermediate layer and an image receiving layer are sequentially provided on a base material, wherein the intermediate layer has a particle diameter of 0.1 mm obtained by thermally expanding a thermally expandable plastic substance.
1 to 100 μm hollow particles, or particle diameter 0.1 to
An image-receiving sheet for thermal transfer recording, comprising: 20 μm microcapsule-shaped hollow polymer hollow particles; and a layer mainly composed of an organic solvent resistant polymer. DETAILED DESCRIPTION OF THE INVENTION The hollow particles preferably used as the main component of the intermediate layer in the present invention include the following substances. (1) Thermoexpandable plastic substance Hollow particles having a capsule wall made of a thermoplastic substance such as vinylidene chloride-acrylonitrile copolymer and containing a volatile expanding agent such as propane, n-butane and isobutane inside the particles. Substance. (Specific examples): manufactured by Matsumoto Yushi Co., Ltd .; Matsumoto Microfair F30: manufactured by Chemo Nobel; Expancel 55
1; 642 (2) Microcapsule-shaped hollow polymer A polymer having a shell made of a hard resin such as an acrylic-styrene copolymer and containing water therein, and which, when dried, water jumps out and becomes hollow. (Specific example): manufactured by Rohm &Haas;
The hollow particles as described above generally have a particle size of 0.1-2.
Although it has a particle diameter of about 00 μm, in the present invention, hollow particles having a particle diameter of about 0.1 to 20 μm can be used. If it is less than 0.1 μm, a sufficient heat insulating effect as hollow particles cannot be obtained, and if it exceeds 20 μm, the smoothness of the image receiving layer is reduced and the desired effect cannot be obtained. However, hollow particles obtained by thermally expanding a heat-expandable plastic substance have cushioning properties and are rich in flexibility, so that they can be used if they are 100 μm or less. In the image-receiving sheet of the present invention, the hollow particles as described above are used as an essential component constituting the intermediate layer. However, all of them are dissolved in an organic solvent of the image-receiving layer, for example, methyl ethyl ketone or the like. Use a water-soluble polymer as an adhesive for hollow particles, or provide an organic solvent-resistant polymer layer on the layer containing hollow particles to impart sufficient organic solvent resistance to the intermediate layer There is a need to. As the organic solvent-resistant polymer, a polymer having excellent film-forming ability and capable of suppressing permeation of the organic solvent is preferable. Specifically, for example, hydrophilic polymers such as polyvinyl alcohol, casein, starch and the like can be used. Acrylic ester, ethylene-vinyl acetate copolymer, polyethylene having a carboxyl group, and the like can be given. Among them, polyvinyl alcohol, casein and starch are most preferably used because they are excellent in the desired effects of the present invention. As described above, the intermediate layer of the present invention is constituted as a layer mainly composed of hollow particles and an organic solvent-resistant polymer. Is applied to a substrate using an organic solvent-resistant polymer as an adhesive. When an organic solvent-resistant polymer layer is provided on the layer containing hollow particles, the hollow particles are applied to the base material together with the organic solvent-resistant polymer or other adhesive to form a lower layer. After that, it is generally constituted by a method of providing a barrier layer mainly composed of an organic solvent resistant polymer as an upper layer. The coating amount of the intermediate layer is adjusted in the range of about 1 to 10 g / m 2 , preferably about 2 to 6 g / m 2 when the hollow particles are a heat-expandable plastic substance. 5 to 50 g / m 2 approximately in the case of hollow polymer is preferably applied about 10 to 30 g / m 2. In the case where the intermediate layer is composed of two layers, it is desirable to apply the overcoat layer containing an organic solvent-resistant polymer as a main component at about 2 g / m 2 or more. In the intermediate layer, pigments such as kaolin, calcium carbonate, titanium oxide and the like, lubricants, fluorescent dyes and the like are used as long as the heat insulating property and cushioning property of the hollow particles and the barrier property of the organic solvent resistant polymer are not impaired. Various auxiliaries can be appropriately added. As the base material constituting the image receiving sheet, for example, synthetic paper, woodfree paper, art paper, coated paper, cast paper, polymer film, and the like are appropriately used. Also,
A composite substrate obtained by laminating two or more of these materials is also used. The image receiving layer is made of a resin having a polar group such as polyester, polyamide, acrylic resin, acetate resin, polystyrene resin, vinyl chloride / vinyl acetate copolymer resin, or a mixture of two or more kinds thereof. It is formed by applying a solution dissolved in an organic solvent such as xylene or methyl ethyl ketone to a dry weight of about 2 to 10 g / m 2 . Further, if necessary, a coat layer made of a synthetic resin, a pigment, an adhesive, or the like may be appropriately provided on the back surface of the base material in order to prevent curling and to provide paper feeding suitability. For the purpose of improving the appearance and smoothness of the image receiving sheet, an intermediate layer may be applied and dried, or after the image receiving layer is provided, a smoothing treatment may be performed by a pressing device such as a super calender. Further, if necessary, an antistatic treatment with a surfactant or the like can be applied to the front or back surface of the image receiving sheet. The present invention will be described below in more detail with reference to Examples, but it should be understood that the present invention is by no means restricted to such specific Examples. In addition, the part in an example shows a weight part. Reference Example 1 Shell wood softening point temperature of 80 g / m 2 of high quality paper
2. The lower layer of an intermediate layer composed of 70 parts of a heat-expandable plastic substance of 85 ° C., Matsumoto Microsphere F-30 (manufactured by Matsumoto Yushi K.K.) and 30 parts of a general-purpose SBR, is dried on a weight basis.
It was applied so as to be 5 g / m 2 and dried at 120 ° C. for 1 minute. Due to this thermal drying, the thermally expandable plastic material expanded 30 to 70 times in volume. As an upper layer of the intermediate layer, 3.5 g / m 2 of polyvinyl alcohol was applied by dry weight, and an image receiving layer having the following composition was further applied thereon by 4 g by dry weight.
/ M 2 and dried at 120 ° C. for 5 minutes to obtain an image receiving sheet. Composition of image receiving layer Polyester resin: Vylon 200 (Toyobo): 1.0 part Amino-modified silicone KF-393 (Shin-Etsu Chemical) 0.03 part Epoxy-modified silicone: X-22-343 (Shin-Etsu) Chemical industry) 0.03 parts Methyl ethyl ketone / toluene / cyclohexane (weight ratio 4: 4: 2) 9.0 parts Next, an ink composition for forming a thermal transfer layer having the following composition was prepared. A transfer sheet was obtained by applying a 9 μm thick PET film having a heat-resistant back surface to a dry weight of 1.0 g / m 2 and drying. Ink composition for forming thermal transfer layer Disperse dye: KST-B-714 (Nippon Kayaku) 0.45 parts Polyvinyl butyral: BX-1 (Sekisui Chemical) 0.4 parts Methyl ethyl ketone / toluene (weight ratio) 1: 1) 9.2 parts The transfer sheet and the image-receiving sheet obtained above were combined, and were subjected to a thermal head using an energy density of 70 mJ / mm 2 , a pulse width of 10 msec, and a dot density of 6 dots / mm. Printed with. As a result of the print test,
An image with no transfer omission and extremely high transfer density was obtained. Example 1 The intermediate layer was made of a heat-expandable plastic material-70 parts of Matsumoto Microsphere F-30 and 30 parts of polyvinyl alcohol.
All the procedures were performed in the same manner as in Reference Example 1 except that the sample was composed of a single layer consisting of As a result of the printing test, an image having no transfer omission and having an extremely high transfer density was obtained. Example 2 The image receiving sheet obtained in Example 1 was subjected to heating and pressure smoothing with a thermal super calendar. This treatment reduced the thickness of the image receiving sheet from 165 microns to 110 microns. Others were the same as in Reference Example 1. As a result of the printing test, an image having a high transfer density without any transfer omission was obtained. Example 3 A general-purpose SBR 70 was placed on the back of the image receiving sheet obtained in Example 1.
, A back coat layer consisting of 30 parts of calcium carbonate and 2 parts of polyethylene wax was applied in the same manner as in Reference Example 1, except that the dry weight was 10 g / m 2 . As a result of the printing test, an image having a high transfer density without any transfer omission was obtained. Further, even when left under a low humidity of 30 ° C. and RH 10% and a high humidity of 40 ° C. and RH 90% each for 12 hours or more, almost no curling occurred. Example 4 The procedure of Example 1 was repeated except that a white polyethylene terephthalate (PET) film having a thickness of 100 microns was used as a base material. As a result of the printing test, an image having no transfer omission and having an extremely high transfer density was obtained. Example 5 The image receiving sheet obtained in Example 4 was subjected to heating and pressure smoothing using a heat super calendar. This treatment reduced the thickness from 145 microns to 123 microns. Others were the same as in Reference Example 1. As a result of the printing test, an image having no transfer omission and having a high transfer density was obtained. Reference Example 2 In Reference Example 1, the hollow polymer was used as the lower layer of the intermediate layer.
The same procedure as in Reference Example 1 was carried out except that a composition comprising 80 parts of Low-Pake OP-84J (manufactured by Rohm & Haas) and 20 parts of general-purpose SBR was applied so as to have a dry weight of 20 g / m 2 . As a result of the printing test, as in Reference Example 1, an image having no transfer omission and having a high transfer density was obtained. Comparative Example 1 When the lower layer was formed and the image receiving layer was directly applied without providing the upper layer of the intermediate layer in Reference Example 1, the solvent of the image receiving layer penetrated into the substrate and caused strikethrough. As a result of performing a printing test in the same manner as in Reference Example 1, the transfer density was low, and a spot-like transfer omission occurred frequently. Further, when the paper thickness before and after the image receiving layer was applied was measured, the paper thickness was reduced from 160 μm to 135 μm, and it was clear that the paper was dissolved in the lower layer of the intermediate layer or the organic solvent of the image receiving layer. COMPARATIVE EXAMPLE 2 Except that the intermediate layer was formed of a layer consisting of 70 parts of Matsumoto Microsphere M600 (manufactured by Matsumoto Yushi K.K.) and 30 parts of polyvinyl alcohol, hollow particles having an average particle diameter of 40 μm. All were performed in the same manner as in Reference Example 1. As a result of the printing test, transfer omission was large and transfer density was lowered. Comparative Example 3 An image receiving layer was applied directly after forming a lower layer without providing an upper layer of the intermediate layer in Reference Example 2. As a result of performing a printing test in the same manner as in Reference Example 1, an image having many transfer omissions and low transfer density was obtained. The image-receiving sheets obtained in the examples of the present invention were able to obtain beautiful images with no transfer omission and high transfer density. In the case where the intermediate layer contains a thermally expanded plastic substance as in Example 2 and Example 5, when the intermediate layer is formed, the intermediate layer is subjected to a smoothing treatment with a thermal super calender. Even when the thermally expandable particles were crushed to a substantially film-like state, there was no transfer omission and an image having a high transfer density was obtained. When the substrate was a polyolefin-based synthetic paper or a polymer film, curling of the image receiving sheet due to thermal shrinkage of the substrate during printing could be prevented by the heat insulating effect of the intermediate layer.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 江頭 典孝 千葉県市川市新井３丁目10番地１号 (72)発明者 岩田 珠美 東京都荒川区東尾久５丁目６番15号 (56)参考文献 特開 昭61−270192（ＪＰ，Ａ) 特開 昭62−117787（ＪＰ，Ａ) 特開 昭61−172795（ＪＰ，Ａ) 特公 平８−32487（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) B41M 5/28 - 5/34 B41M 5/38 - 5/40 ──────────────────────────────────────────────────続 き Continued on the front page (72) Noritaka Ega, Inventor 3-10-1, Arai, Ichikawa-shi, Chiba (72) Inventor Tamami Iwata 5-6-15, Higashiogu, Arakawa-ku, Tokyo (56) References JP JP-A-61-270192 (JP, A) JP-A-62-117787 (JP, A) JP-A-67-172795 (JP, A) JP-B 8-32487 (JP, B2) (58) Fields investigated (Int .Cl. 7 , DB name) B41M 5/28-5/34 B41M 5/38-5/40
Claims (1)
受像シートにおいて、該中間層が、熱膨張性の可塑性物
質を熱膨張させて得られる粒子径０．１〜１００μｍの
中空の粒子、あるいは粒子径０．１〜２０μｍのマイク
ロカプセル状の中空ポリマーの中空の粒子と、耐有機溶
剤性の高分子を主成分とする層で構成されており、該受
像層が、極性基を有する樹脂を有機溶剤に溶解した溶液
を塗布して形成されていることを特徴とする熱転写記録
用受像シート。２． 中空の粒子が、熱膨張性の可塑性物質を熱膨張さ
せて得られる粒子径０．１〜１００μｍの中空の粒子で
あることを特徴とする請求項１記載の熱転写記録用受像
シート。３． 前記耐有機溶剤性の高分子が、ポリビニルアルコ
ール、カゼイン及び澱粉から選ばれる少なくとも１種で
あることを特徴とする請求項１又は２に記載の熱転写記
録用受像シート。４．中空の粒子が、塩化ビニリデン−アクリロニトリル
共重合体又はアクリル−スチレン共重合体からなる中空
の粒子であることを特徴とする請求項１〜３のいずれか
１項に記載の熱転写記録用受像シート。 (57) [Claims] In a thermal transfer recording image-receiving sheet having an intermediate layer and an image receiving layer sequentially provided on a base material, the intermediate layer is a hollow particle having a particle diameter of 0.1 to 100 μm obtained by thermally expanding a thermally expandable plastic substance, Alternatively , it is composed of hollow particles of a microcapsule-shaped hollow polymer having a particle diameter of 0.1 to 20 μm and a layer mainly composed of an organic solvent resistant polymer.
A solution in which the image layer is a resin having a polar group dissolved in an organic solvent.
An image-receiving sheet for thermal transfer recording, characterized by being formed by coating . 2. Hollow particles according to claim 1 Symbol placement of the thermal transfer recording image receiving sheet, characterized in that the thermal expansion of the plastic material is a hollow particle having a particle diameter 0.1~100μm obtained by thermal expansion. 3. 3. The thermal transfer recording image-receiving sheet according to claim 1, wherein the organic solvent-resistant polymer is at least one selected from polyvinyl alcohol, casein, and starch. 4. The hollow particles are vinylidene chloride-acrylonitrile
Hollow made of copolymer or acrylic-styrene copolymer
A particle according to any one of claims 1 to 3,
Item 2. The image receiving sheet for thermal transfer recording according to Item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02475399A JP3226167B2 (en) | 1999-02-02 | 1999-02-02 | Image receiving sheet for thermal transfer recording |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02475399A JP3226167B2 (en) | 1999-02-02 | 1999-02-02 | Image receiving sheet for thermal transfer recording |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62186096A Division JPH0832487B2 (en) | 1987-07-24 | 1987-07-24 | Image receiving sheet for thermal transfer recording |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11321128A JPH11321128A (en) | 1999-11-24 |
| JP3226167B2 true JP3226167B2 (en) | 2001-11-05 |
Family
ID=12146917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02475399A Expired - Lifetime JP3226167B2 (en) | 1999-02-02 | 1999-02-02 | Image receiving sheet for thermal transfer recording |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3226167B2 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPH11321128A (en) | 1999-11-24 |
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