JP4324913B2 - Intermediate transfer sheet for thermal transfer image recording - Google Patents
Intermediate transfer sheet for thermal transfer image recording Download PDFInfo
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- JP4324913B2 JP4324913B2 JP2004032398A JP2004032398A JP4324913B2 JP 4324913 B2 JP4324913 B2 JP 4324913B2 JP 2004032398 A JP2004032398 A JP 2004032398A JP 2004032398 A JP2004032398 A JP 2004032398A JP 4324913 B2 JP4324913 B2 JP 4324913B2
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Landscapes
- Thermal Transfer Or Thermal Recording In General (AREA)
Description
本発明は、熱転写シートを用いて熱転写にて中間転写シートに記録し、その後カード、CD-R等およびプレート等の樹脂成型物からなる最終被転写体にサーマルヘッドを備えた熱転写プリンタや熱ロールやホットスタンプによって再転写する中間転写方式の中間転写シートに属する。 The present invention relates to a thermal transfer printer or a thermal roll in which a thermal transfer sheet is used to record on an intermediate transfer sheet by thermal transfer, and then a thermal transfer head is provided on a final transfer body made of a resin molded product such as a card, CD-R, etc. It belongs to an intermediate transfer sheet of an intermediate transfer system that is retransferred by hot stamping.
クレジットカードやメンバーズカード等のIDカードの表面に溶融熱転写で記録された画像は、しばしば高い堅牢性が要求される。そこで、従来中間転写方式で、被転写体での画像の堅牢性を高める方法として中間転写シートに保護層を設ける方法がとられてきた。（特許文献１参照。）この保護層には、アクリル樹脂等の堅牢性の良い熱可塑性樹脂が用いられてきた。熱可塑性樹脂による保護層の堅牢性をさらに上回る堅牢性の要求には、保護層を硬化性樹脂で形成する方法がある
保護層を硬化させるには熱もしくは電離放射線による硬化が一般的である。熱硬化の場合は、転写フィルム状態において保護層をあらかじめ硬化させる。なぜなら熱硬化は一般的に時間がかかるため、転写後での熱処理はシステムの簡便性に劣る。また、画像形成物の熱変形等による不具合が生じることが多々ある。
An image recorded by the fusion thermal transfer on the surface of an ID card such as a credit card or a members card is often required to have high robustness. Therefore, in the conventional intermediate transfer method, a method of providing a protective layer on the intermediate transfer sheet has been taken as a method for improving the fastness of the image on the transfer target. (Refer to patent document 1.) For this protective layer, a thermoplastic resin having good fastness such as an acrylic resin has been used. The demand for fastness that exceeds the fastness of the protective layer by the thermoplastic resin includes a method of forming the protective layer from a curable resin. To cure the protective layer, curing by heat or ionizing radiation is generally used. In the case of heat curing, the protective layer is cured in advance in the transfer film state. Because heat curing generally takes time, heat treatment after transfer is inferior in system simplicity. Further, there are many problems caused by thermal deformation or the like of the image formation.
一方、電離放射線硬化の場合は保護層を転写前に硬化させても転写後に硬化させても良い。ところで上述のごとく、堅牢性を向上させるため、転写フィルム状態で保護層をあらかじめ硬化した場合、保護層の熱溶融性は著しく低下し箔切れ性が悪化する。その結果、エッジ部分等での保護層のキレ性が悪くなる（この現象を面状剥離と呼ぶ）。箔切れ性を良好に維持するためには、膜厚を薄くする必要があり、保護層の厚みはかなり制限される。よって高い堅牢性を得ることは困難である。 On the other hand, in the case of ionizing radiation curing, the protective layer may be cured before transfer or after transfer. By the way, as mentioned above, in order to improve the fastness, when the protective layer is previously cured in the transfer film state, the heat melting property of the protective layer is remarkably lowered and the foil breakability is deteriorated. As a result, the sharpness of the protective layer at the edge portion or the like deteriorates (this phenomenon is called planar peeling). In order to maintain the foil cutting property well, it is necessary to reduce the film thickness, and the thickness of the protective layer is considerably limited. Therefore, it is difficult to obtain high robustness.
転写後に電離放射線の照射によって保護層を硬化させる手法においては上記のような問題はないが、別の問題がある。電離放射線硬化樹脂は硬化前は通常タックがあり、熱転写にて良好な印刷を行なう為の受像兼接着層の積層が困難であり、良好な熱転写記録用中間転写シートを得ることは出来なかった。 Although there is no problem as described above in the method of curing the protective layer by irradiation with ionizing radiation after transfer, there is another problem. The ionizing radiation curable resin usually has a tack before curing, and it is difficult to laminate an image receiving / adhesive layer for performing good printing by thermal transfer, and a good intermediate transfer sheet for thermal transfer recording could not be obtained.
中間転写シートへの画像転写が良好で、かつ被転写体上の画像の堅牢性が優れた中間転写シートを提供することを目的とする。 An object of the present invention is to provide an intermediate transfer sheet that is excellent in image transfer onto an intermediate transfer sheet and excellent in image fastness on a transfer target.
このような目的を達成する為検討を行った結果、支持体上に、少なくとも保護層、受像兼接着層が設けられた熱転写画像記録用の中間転写シートにおいて、その保護層が主成分として電離放射線照射による硬化が可能であるアクリル−シリカハイブリッド樹脂を含有することにより良好な特性が得られることを見出し本発明に至った。 As a result of studies to achieve such an object, in an intermediate transfer sheet for thermal transfer image recording in which at least a protective layer and an image receiving / adhesive layer are provided on a support, the protective layer is a main component of ionizing radiation. It has been found that good characteristics can be obtained by containing an acrylic-silica hybrid resin that can be cured by irradiation.
すなわち請求項１にかかる発明は、支持体上に、少なくとも保護層、受像兼接着層が設けられた熱転写画像記録用の中間転写シートにおいて、その保護層が主成分として電離放射線照射による硬化が可能であるアクリル−シリカハイブリッド樹脂を含有し、且つ受像兼接着層に印刷して画像を形成後中間転写シートを被転写体に重ねて再転写し、支持体を剥離した後に保護層に電離放射線を照射硬化させて使われることを特徴とする熱転写画像記録用の中間転写シートである。
また、請求項２にかかる発明は、請求項１の中間転写シートを基本とし、アクリル−シリカハイブリッド樹脂のシリカ成分が１５重量％以上６０重量％以下であり、常温において硬化前にタックが無いことを特徴とする熱転写画像記録用の中間転写シート。つぎに、請求項３にかかる発明は、請求項１、２の中間転写シートを基本とし、硬化前のアクリル−シリカハイブリッド樹脂が３０℃以上のＴｇを有することを特徴とする熱転写画像記録用の中間転写シート。
また、請求項４にかかる発明は、請求項１〜３の中間転写シートを基本とし、保護層と受像兼接着層との間に中間層を設け、その中間層が主成分としてポリエステルウレタン樹脂を含有することを特徴とする熱転写画像記録用の中間転写シート。
本発明に係る中間転写シートは、基本構成として、支持体上に保護層、受像兼接着層が順に構成されたものである。
That is, the invention according to claim 1 is an intermediate transfer sheet for thermal transfer image recording in which at least a protective layer and an image receiving / adhesive layer are provided on a support, and the protective layer can be cured by irradiation with ionizing radiation as a main component. After forming an image by printing on the image-receiving / adhesive layer, the intermediate transfer sheet is superimposed on the transfer target, re-transferred, the support is peeled off, and ionizing radiation is then applied to the protective layer. An intermediate transfer sheet for thermal transfer image recording, which is used after being cured by irradiation .
The invention according to claim 2 is based on the intermediate transfer sheet according to claim 1, wherein the silica component of the acrylic-silica hybrid resin is 15% by weight or more and 60% by weight or less, and has no tack before curing at room temperature. An intermediate transfer sheet for recording a thermal transfer image. Next, the invention according to claim 3 is based on the intermediate transfer sheet according to claims 1 and 2, and the acrylic-silica hybrid resin before curing has a Tg of 30 ° C. or more. Intermediate transfer sheet.
The invention according to claim 4 is based on the intermediate transfer sheet according to claims 1 to 3, wherein an intermediate layer is provided between the protective layer and the image receiving / adhesive layer, and the intermediate layer is a polyester urethane resin as a main component. An intermediate transfer sheet for thermal transfer image recording, comprising:
In the intermediate transfer sheet according to the present invention, as a basic structure, a protective layer and an image receiving / adhesive layer are sequentially formed on a support.
本発明に用いられる支持体としては、従来の熱転写フィルムに使用されているものと同じ支持体をそのまま用いることができると共に、シートの表面に易接着処理のしてあるものや、その他のものも使用することができ、特に制限はされない。 As the support used in the present invention, the same support as that used in the conventional thermal transfer film can be used as it is, and those having an easy adhesion treatment on the surface of the sheet and others are also available. It can be used and is not particularly limited.
好ましい支持体の具体例としては、例えば、ポリエチレンテレフタレートを始めとするポリエステル、ポリカーボネート、ポリアミド、ポリイミド、酢酸セルロース、ポリ塩化ビニリデン、ポリ塩化ビニル、ポリスチレン、フッ素樹脂、ポリプロピレン、ポリエチレン、アイオノマー等のプラスチックフィルム、及びグラシン紙、コンデンサー紙、パラフィン紙等の紙類、セロファン等があり、また、これらの２種以上を積層した複合フィルムなども使用できる。さらに、プラスチック成形物への転写を考慮する場合には、転写フィルムが成形物の形に添うように熱変形することが好ましく、易成形ＰＥＴやアクリルフィルム等、熱変形が容易な支持体を使用するのが良い。これらの支持体の厚さは、その強度及び耐熱性が適切になるように材料に応じて適宜変更しているが、通常は１．０〜１００μｍ程度が好ましい。 Specific examples of preferable supports include, for example, polyester films such as polyethylene terephthalate, polycarbonate, polyamide, polyimide, cellulose acetate, polyvinylidene chloride, polyvinyl chloride, polystyrene, fluororesin, polypropylene, polyethylene, and ionomer. , And papers such as glassine paper, condenser paper, paraffin paper, cellophane, etc., and composite films in which two or more of these are laminated can also be used. Furthermore, when considering transfer to a plastic molded product, it is preferable that the transfer film is thermally deformed so that it conforms to the shape of the molded product, and a support that can be easily thermally deformed, such as easily molded PET or acrylic film, is used. Good to do. The thickness of these supports is appropriately changed depending on the material so that the strength and heat resistance thereof are appropriate, but usually about 1.0 to 100 μm is preferable.
つぎに本発明の特徴である保護層は、電離放射線照射による硬化が可能であるアクリル−シリカハイブリッド樹脂を主成分として含有する。該アクリル−シリカハイブリッド樹脂は、そのシリカ成分が１５重量％以上６０重量％以下であることが好ましく、さらに好ましくは２０重量％以上３０重量％以下であることが好ましい。上記範囲以外では膜強度が低下し、保護層としての機能が劣化することがある。また、アクリル−シリカハイブリッド樹脂は硬化前には常温でタックがないことが好ましい。タックが無いことにより、多層化が可能となり、熱転写による印刷適性の高い受像兼接着層を簡便に設けることを可能とする。また、該アクリル−シリカハイブリッド樹脂の硬化前のＴｇは３０℃以上であることが好ましい。３０℃未満では常温でタックが出やすくなる傾向がある。 Next, the protective layer, which is a feature of the present invention, contains, as a main component, an acrylic-silica hybrid resin that can be cured by irradiation with ionizing radiation. The acrylic-silica hybrid resin preferably has a silica component of 15% by weight to 60% by weight, more preferably 20% by weight to 30% by weight. Outside the above range, the film strength is lowered, and the function as a protective layer may be deteriorated. The acrylic-silica hybrid resin preferably has no tack at room temperature before curing. Due to the absence of tack, multilayering is possible, and an image receiving / adhesive layer having high printability by thermal transfer can be easily provided. Moreover, it is preferable that Tg before hardening of this acrylic-silica hybrid resin is 30 degreeC or more. If it is less than 30 degreeC, there exists a tendency for tack to come out easily at normal temperature.
さらに保護層の強靱性等を向上させる目的でアクリロイル基やメタクリロイル基を有する、ポリエステルアクリレート、ポリウレタンアクリレート、エポキシアクリレート、シリコーンアクリレート等の各種アクリレート系オリゴマーやプレポリマー、或いはポリエン−チオール系樹脂等にスチレン等の単官能モノマー、トリメチロールプロパントリアクリレート等の多官能モノマーを添加しても良い。ただしこれらのアクリレートのほとんどは、硬化前の性状が液体であったり、粘性物質であるので、保護層にタックを生じさせない範囲での添加に限られる。また上記電離放射線硬化樹脂以外にも熱可塑性樹脂を添加することができる。該熱可塑性樹脂としては、例えばアクリル系樹脂、酢酸ビニル系樹脂、エポキシ系樹脂、ポリエステル系樹脂、ポリカーボネート系樹脂、ブチラール系樹脂、ゼラチン、セルロース系樹脂、ポリアミド系樹脂、塩化ビニル系樹脂、ウレタン系樹脂等が挙げられる。その他の添加剤として、紫外線吸収剤、着色顔料、白色顔料、体質顔料、充填剤、帯電防止剤、酸化防止剤、蛍光増白剤、染料等も適宜、必要に応じて使用することができる。 Furthermore, for the purpose of improving the toughness of the protective layer, various acrylate oligomers and prepolymers such as polyester acrylate, polyurethane acrylate, epoxy acrylate and silicone acrylate having acryloyl group and methacryloyl group, or styrene for polyene-thiol resin, etc. A monofunctional monomer such as trifunctional monomer or a polyfunctional monomer such as trimethylolpropane triacrylate may be added. However, most of these acrylates are limited to addition in a range that does not cause tackiness in the protective layer because the properties before curing are liquid or viscous substances. In addition to the ionizing radiation curable resin, a thermoplastic resin can be added. Examples of the thermoplastic resin include acrylic resins, vinyl acetate resins, epoxy resins, polyester resins, polycarbonate resins, butyral resins, gelatin, cellulose resins, polyamide resins, vinyl chloride resins, urethane resins. Examples thereof include resins. As other additives, ultraviolet absorbers, colored pigments, white pigments, extender pigments, fillers, antistatic agents, antioxidants, fluorescent whitening agents, dyes, and the like can be used as necessary.
保護層の厚みは、好ましくは０．1〜１０μm、さらに好ましくは０．５〜５μmである。上記範囲未満では保護層としての効果が弱く、上記範囲を超えるとコスト高となる。 The thickness of the protective layer is preferably 0.1 to 10 μm, more preferably 0.5 to 5 μm. If it is less than the said range, the effect as a protective layer will be weak, and if it exceeds the said range, it will become expensive.
次に受像兼接着層は、熱転写シートから画像を良好に受像する機能とともに、被転写体への再転写時、被転写体表面への良好な接着性を有する機能を具備する必要がある。熱転写シートが溶融型熱転写シートの場合は、主成分樹脂に軟化点が100℃以上のスチレン系樹脂、エポキシ樹脂、アクリル樹脂等を用いる事が好ましい。また、必要に応じて接着性を高める意味で柔軟で接着性の高いウレタン樹脂、ポリエステル樹脂、オレフィン系樹脂等を加えることができる。また、ブロッキング、タック防止の意味で各種フィラを添加することが可能である。たとえば、フッ素樹脂系粒子、メラミン樹脂粒子、シリコン系粒子、タルク、カオリン、炭酸マグネシュウム、炭酸カリウム、酸化チタン、シリカ、デンプン等があげられる。熱転写シートが昇華型熱転写シートの場合の受像兼接着層に用いる樹脂は、例えば、線状飽和ポリエステル等のポリエステル系樹脂、ポリ塩化ビニル、塩化ビニル／酢酸ビニル共重合物等の塩化ビニル系樹脂、ポリアクリル酸、ポリアクリル酸メチル、ポリアクリル酸−２−ナフチル、ポリメタクリル酸、ポリメタクリル酸エチル、ポリアクリロニトリル、ポリメタクリロメチル等のアクリル系樹脂、ポリスチレン、ポリビニルベンゼン、ポリビニルブチラール、スチレン−ブタジエン共重合物等のビニル系樹脂等をあげることができる。また、ブロッキング、タック防止の意味で前記の各種フィラを添加することが可能である。 Next, the image receiving / adhesive layer needs to have a function of receiving an image from the thermal transfer sheet satisfactorily and a function of having good adhesiveness to the surface of the transferred body when retransferred to the transferred body. When the thermal transfer sheet is a melt-type thermal transfer sheet, it is preferable to use a styrene resin, an epoxy resin, an acrylic resin, or the like having a softening point of 100 ° C. or higher as the main component resin. In addition, a flexible and highly adhesive urethane resin, polyester resin, olefin-based resin, or the like can be added as necessary to increase the adhesiveness. Various fillers can be added to prevent blocking and tack. Examples thereof include fluororesin-based particles, melamine resin particles, silicon-based particles, talc, kaolin, magnesium carbonate, potassium carbonate, titanium oxide, silica, starch and the like. The resin used for the image receiving and adhesive layer when the thermal transfer sheet is a sublimation thermal transfer sheet is, for example, a polyester resin such as linear saturated polyester, a vinyl chloride resin such as polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, Acrylic resins such as polyacrylic acid, polymethyl acrylate, polyacrylic acid-2-naphthyl, polymethacrylic acid, polyethyl methacrylate, polyacrylonitrile, polymethacrylomethyl, polystyrene, polyvinylbenzene, polyvinyl butyral, styrene-butadiene Examples thereof include vinyl resins such as copolymers. Moreover, it is possible to add said various fillers in the meaning of blocking and tack prevention.
受像兼接着層の厚みは、０．１〜１０．０μｍの範囲が好ましい。厚みが、前記範囲未満であると、被転写体への接着力が低下する。前記範囲を超えると熱感度が低下する。 The thickness of the image receiving / adhesive layer is preferably in the range of 0.1 to 10.0 μm. When the thickness is less than the above range, the adhesive force to the transferred body is reduced. If it exceeds the above range, the thermal sensitivity is lowered.
保護層と受像兼接着層との間に中間層を設けることがさらに好ましい。中間層を設置することにより、保護層硬化後の保護層と受像兼接着層との密着性が低下することを防ぐことが出きる。その中間層の主成分としてポリエステルウレタン樹脂を含有することが好ましい。また、中間層にはポリエステルウレタンの他、熱可塑性樹脂を添加することができる。
該熱可塑性樹脂としては、例えばアクリル系樹脂、酢酸ビニル系樹脂、エポキシ系樹脂、ポリエステル系樹脂、ポリカーボネート系樹脂、ブチラール系樹脂、ゼラチン、セルロース系樹脂、ポリアミド系樹脂、塩化ビニル系樹脂、ウレタン系樹脂等が挙げられる。
More preferably, an intermediate layer is provided between the protective layer and the image receiving / adhesive layer. By providing the intermediate layer, it is possible to prevent the adhesion between the protective layer after curing of the protective layer and the image receiving / adhesive layer from being deteriorated. It is preferable to contain a polyester urethane resin as a main component of the intermediate layer. In addition to the polyester urethane, a thermoplastic resin can be added to the intermediate layer.
Examples of the thermoplastic resin include acrylic resins, vinyl acetate resins, epoxy resins, polyester resins, polycarbonate resins, butyral resins, gelatin, cellulose resins, polyamide resins, vinyl chloride resins, urethane resins. Examples thereof include resins.
中間層の厚みは、０．１〜１０．０μｍの範囲が好ましい。厚みが、前記範囲未満であると保護層と受像兼接着層に対する密着性が充分に得られない。
また、厚みが前記以上になると箔切れが低下する。
保護層が支持体から剥離しにくい場合には、支持体と保護層との間に離型層を形成することができる。離型層は、例えば、ワックス類、シリコーンワックス、シリコーン樹脂、フッ素樹脂、アクリル樹脂、ポリビニルアルコール樹脂、セルロース誘導体樹脂、ウレタン系樹脂、酢酸系ビニル樹脂、アクリルビニルエーテル系樹脂、無水マレイン酸樹脂、及びこれらの樹脂群の共重合体を少なくとも１種以上含有する塗布液を、従来公知のグラビアコート、グラビアリバースコート等の方法で塗布、乾燥することにより形成することができる。
The thickness of the intermediate layer is preferably in the range of 0.1 to 10.0 μm. If the thickness is less than the above range, sufficient adhesion to the protective layer and the image receiving / adhesive layer cannot be obtained.
Moreover, when the thickness is equal to or greater than the above, foil breakage is reduced.
When the protective layer is difficult to peel from the support, a release layer can be formed between the support and the protective layer. The release layer includes, for example, waxes, silicone wax, silicone resin, fluorine resin, acrylic resin, polyvinyl alcohol resin, cellulose derivative resin, urethane resin, acetic acid vinyl resin, acrylic vinyl ether resin, maleic anhydride resin, and It can be formed by applying and drying a coating solution containing at least one copolymer of these resin groups by a conventionally known method such as gravure coating or gravure reverse coating.
離型層は、熱転写時に被転写体に移行するもの、あるいは基材シート側に残るもの、あるいは凝集破壊するもの等を、適宜選択することができるが、離型層が非転写性であり、熱転写により離型層が基材シート側に残存し、離型層と転写保護層との界面が熱転写された後の保護層表面になるようにすることが、表面光沢性、保護層の転写安定性等の点で優れているために、好ましく行われる。離型層の形成方法は、従来公知の塗工方法で形成でき、その塗工厚みは乾燥状態で０．５〜５．０μｍ程度で十分である。又、転写後に艶消しの保護層が望ましい場合には、離型層中に各種の粒子を包含させるか、あるいは離型層の保護層側の表面をマット処理することにより、表面マット状にすることも出来る。尚、支持体と保護層と剥離性が良好であれば、上記の離型層を設けることなく、保護層が熱転写により、支持体から直接剥離することができる。 The release layer can be appropriately selected from those that move to the transfer target during thermal transfer, those that remain on the base sheet side, or those that cohesively break down, but the release layer is non-transferable, The release layer remains on the base sheet side due to thermal transfer, and the interface between the release layer and the transfer protective layer becomes the surface of the protective layer after the thermal transfer, surface glossiness, transfer stability of the protective layer Since it is excellent in terms of properties and the like, it is preferably performed. The release layer can be formed by a conventionally known coating method, and a coating thickness of about 0.5 to 5.0 μm is sufficient in a dry state. If a matte protective layer is desired after transfer, various types of particles are included in the release layer, or the surface of the release layer on the protective layer side is matted to form a surface mat. You can also If the peelability between the support and the protective layer is good, the protective layer can be peeled directly from the support by thermal transfer without providing the release layer.
各層には、製膜助剤、塗液安定剤、レベリング剤、消泡剤等の添加剤を添加することもできる。各層は、構成材料を適切な溶剤に溶解して塗工液を作り、各種のコーティング方法で支持体上に塗布、乾燥することで形成することができる。 In each layer, additives such as a film-forming auxiliary, a coating solution stabilizer, a leveling agent, and an antifoaming agent can be added. Each layer can be formed by dissolving a constituent material in an appropriate solvent to form a coating solution, and applying and drying the coating material on a support by various coating methods.
中間転写シートに記録された画像を、被転写体に圧接して、加熱して再転写する方法としては、サーマルヘッドを備えた熱転写プリンタや、熱ロール、ホットスタンプ等を用いて行うことができる。上記の再転写部の加熱手段において、部分的な転写ではサーマルヘッドもしくはホットスタンプの手段を用いることが望ましく、被転写体全面に転写する場合は熱ロール方式が望ましい。これにより、被転写体には熱転写画像を覆うように、受像兼接着層、中間層、保護層、剥離層が積層された印画物となる。 As a method for re-transferring the image recorded on the intermediate transfer sheet by being pressed against the transfer material and heating, it can be performed using a thermal transfer printer equipped with a thermal head, a thermal roll, a hot stamp, or the like. . As the heating means of the retransfer section, it is desirable to use a thermal head or hot stamp means for partial transfer, and when transferring to the entire surface of the transfer target, a hot roll method is desirable. As a result, a printed material in which the image receiving / adhesive layer, the intermediate layer, the protective layer, and the release layer are laminated so as to cover the thermal transfer image on the transfer object is obtained.
本発明の中間転写シートに、熱転写プリンターで熱転写画像を形成したものは高精細な画像となり、この画像を被転写体に再転写した画像も高精細な画像を保ち、画像の堅牢性は、従来の中間転写シートには見られなかった高堅牢性を得ることができた。 The intermediate transfer sheet of the present invention, in which a thermal transfer image is formed by a thermal transfer printer, becomes a high-definition image. An image obtained by retransferring this image to a transfer object also maintains a high-definition image. It was possible to obtain high fastness that was not found in the intermediate transfer sheet.
次に実施例及び比較例を挙げて本発明を更に具体的に説明する。
１．熱転写シートの製造
裏面に耐熱処理を施した厚さ4.5μmのPETフィルム上に、イエロー、マゼンタ、シアンの顔料を溶剤と共に塩化ビニル酢酸ビニル共重合樹脂に分散し、３色の着色インキとし、グラビアコートにより、塗布厚み0.5μmにて塗布し、３色の溶融型熱転写シートをそれぞれ製造した。
Next, the present invention will be described more specifically with reference to examples and comparative examples.
1. On the backside of the heat transfer sheet manufactured on a 4.5μm thick heat-treated PET film, yellow, magenta, and cyan pigments are dispersed in a vinyl chloride vinyl acetate copolymer resin together with a solvent to obtain a three-colored color ink. The coating was applied at a coating thickness of 0.5 μm to produce three-color melt-type thermal transfer sheets.
２．中間転写シートの製造
支持体として厚み25μmのPETフィルムに、表１の乾燥層厚みになるように、下記塗工液を順に塗布し、実施例１、２、３比較例１の中間転写シートを製造した。
保護層塗工液Ａ
ＵＶ硬化性アクリルシリカハイブリッド樹脂 ７０部（固形分３０％、シリカ成分２３％、Ｔｇ４５℃、Ｍｗ２万）
光開始剤 １．０部（ダロキュア１１７３、チバスペシャリティケミカル製）
増感剤 ０．６部（ＵＶ６３４Ａ、セイコーアドバンス製）
ＭＥＫ ３０部
保護層塗工液Ｂ
ＵＶ硬化性アクリルシリカハイブリッド樹脂 ７０部（固形分３０％、シリカ成分２０％、Ｔｇ５５℃、Ｍｗ２．５万）
光開始剤 １．０部（ダロキュア１１７３、チバスペシャリティケミカル製）
増感剤 １．０部（カヤキュアＥＰＡ、日本化薬製）
ＭＥＫ ３０部
保護層塗工液Ｃ
メタクリル酸メチルエステル樹脂 ２０部（ダイヤナールＢＲ８０、三菱レイヨン製）
ＭＥＫ ８０部
中間層塗工液
ポリエステルウレタン樹脂 ５０部（バイロンＵＲ−３２００、固形分３０％、東洋紡積製）
トルエン ５０部
受像兼接着層塗工液
スチレン樹脂（軟化点130℃） ５部
エポキシ樹脂（軟化点110℃） ５部
トルエン／ＭＥＫ（1/1） ４０部
2. As an intermediate transfer sheet production support, the following coating solutions were applied in order to a PET film having a thickness of 25 μm so that the dry layer thickness shown in Table 1 was obtained. Manufactured.
Protective layer coating liquid A
70 parts of UV curable acrylic silica hybrid resin (solid content 30%, silica component 23%, Tg 45 ° C., Mw 20,000)
Photoinitiator 1.0 part (Darocur 1173, Ciba Specialty Chemicals)
Sensitizer 0.6 parts (UV634A, manufactured by Seiko Advance)
MEK 30 parts protective layer coating solution B
70 parts of UV curable acrylic silica hybrid resin (solid content 30%, silica component 20%, Tg 55 ° C., Mw 25,000)
Photoinitiator 1.0 part (Darocur 1173, Ciba Specialty Chemicals)
Sensitizer 1.0 parts (Kayacure EPA, Nippon Kayaku)
MEK 30 parts protective layer coating liquid C
20 parts of methacrylic acid methyl ester resin (Dianar BR80, manufactured by Mitsubishi Rayon)
MEK 80 parts Intermediate layer coating liquid Polyester urethane resin 50 parts (Byron UR-3200, solid content 30%, manufactured by Toyobo Co., Ltd.)
Toluene 50 parts Image receiving and adhesive layer coating solution Styrene resin (softening point 130 ° C) 5 parts Epoxy resin (softening point 110 ° C) 5 parts Toluene / MEK (1/1) 40 parts
３．特性評価
（１）中間転写シートへの画像形成性
下記の熱転写プリンターと上記の熱転写シートを使って、実施例１〜３、比較例１の中間転写シート上にフルカラーの画像を形成した。形成された画像の画像形成性を評価した。
熱転写プリンター：テストプリンター、300dpiエッジヘッド、剥離距離1.0cm
画像パターン：ポートレート（ISO/DIS12640登録画像データ）
印刷速度：１インチ/秒
評価基準
○：微細なドットまで良好なドット形状が再現される。
×：ドット抜けが多発する。
再転写条件
上記印刷にて画像形成された中間転写シートを縦１０ｃｍ×横１０ｃｍ×厚さ２ミリのアクリル板にホットラミネーター（大成製）を用いて１５０℃で熱ラミし、室温に下がるまで放置した後、基材を剥離した。つづいてコンベア式ＵＶ照射装置（ＧＳ製ＣＳ３０）にて、２００ｍｊ/ｃｍ２の積算光量のＵＶ光を照射して保護層を硬化した。
3. Characteristic Evaluation (1) Image Formability on Intermediate Transfer Sheet Full color images were formed on the intermediate transfer sheets of Examples 1 to 3 and Comparative Example 1 using the following thermal transfer printer and the above thermal transfer sheet. The image formability of the formed image was evaluated.
Thermal transfer printer: Test printer, 300dpi edge head, peeling distance 1.0cm
Image pattern: Portrait (ISO / DIS12640 registered image data)
Printing speed: 1 inch / second evaluation criteria
A: Good dot shape is reproduced up to fine dots.
×: Dot missing frequently occurs.
Retransfer conditions The intermediate transfer sheet imaged by the above printing is heat-laminated at 150 ° C using a hot laminator (made by Taisei Co., Ltd.) on an acrylic plate 10 cm long × 10 cm wide × 2 mm thick and left to cool to room temperature. Then, the substrate was peeled off. Subsequently, the protective layer was cured by irradiating UV light with an integrated light amount of 200 mj / cm 2 with a conveyor type UV irradiation device (CS30 manufactured by GS).
（２）耐溶剤性
試料にエタノール、ＭＥＫ、トルエンをそれぞれ１滴滴下し、３０分後に拭き取り試料の様子を観察する。
○：変化無し、△：若干侵される、×：完全に侵される
(2) One drop each of ethanol, MEK, and toluene is dropped on the solvent-resistant sample, and the state of the sample is observed after 30 minutes.
○: No change, △: Slightly eroded, ×: Completely eroded
（３）耐傷性
試料を２５０ｇ／ｃｍ2の荷重をかけたスチールウール（ボンスター＃００００）で１０回擦る。
○：変化無し、△：若干の傷あり、×：キズ大
(3) The scratch resistance sample is rubbed 10 times with steel wool (Bonster # 0000) applied with a load of 250 g / cm 2 .
○: No change, △: Some scratches, ×: Large scratches
（４）密着性
表面にカッターナイフにて1.5ｍｍの碁盤目を20マス刻み、セロテープ（ニチバンCT-24）にて剥離テストを実施
◎：離脱部分がない ○：離脱が5%未満である △：離脱が5%以上20%未満である ×：離脱が20%以上である
評価結果は、表２の通りであった。
(4) Adhesion surface is cut with 20 squares of 1.5 mm grid with a cutter knife, and a peel test is performed with cello tape (Nichiban CT-24). : Detachment is 5% or more and less than 20%. ×: Evaluation result of desorption is 20% or more is shown in Table 2.
（表２）評価結果
(Table 2) Evaluation results
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004032398A JP4324913B2 (en) | 2004-02-09 | 2004-02-09 | Intermediate transfer sheet for thermal transfer image recording |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004032398A JP4324913B2 (en) | 2004-02-09 | 2004-02-09 | Intermediate transfer sheet for thermal transfer image recording |
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| Publication Number | Publication Date |
|---|---|
| JP2005219452A JP2005219452A (en) | 2005-08-18 |
| JP4324913B2 true JP4324913B2 (en) | 2009-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2004032398A Expired - Lifetime JP4324913B2 (en) | 2004-02-09 | 2004-02-09 | Intermediate transfer sheet for thermal transfer image recording |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6579457B1 (en) * | 2018-06-29 | 2019-09-25 | 大日本印刷株式会社 | Intermediate transfer medium |
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| JP2005219452A (en) | 2005-08-18 |
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