JP4332825B2 - Protective layer transfer sheet - Google Patents
Protective layer transfer sheet Download PDFInfo
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- JP4332825B2 JP4332825B2 JP2000027994A JP2000027994A JP4332825B2 JP 4332825 B2 JP4332825 B2 JP 4332825B2 JP 2000027994 A JP2000027994 A JP 2000027994A JP 2000027994 A JP2000027994 A JP 2000027994A JP 4332825 B2 JP4332825 B2 JP 4332825B2
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- protective layer
- inorganic layered
- layered compound
- average particle
- thermal transfer
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Images
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- Thermal Transfer Or Thermal Recording In General (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、熱転写記録分野において、受像体上に転写された画像の耐擦過性等を向上させるオーバープリント技術に属する。
【０００２】
【従来の技術】
ワックス類及び／または樹脂類からなる保護層、またはその中に粒子を添加した保護層を、受像体上に形成されたカラー画像上に画像保護層としてオーバープリントする技術は公知である。
【０００３】
しかし、ワックス類及び／または樹脂類からなる透明インク層はもとより、粒子を添加した場合においても、ワックス本来の軟弱性あるいは樹脂本来のタック性により耐擦過性が劣化させてしまい、十分な画像保護効果を発揮できないという問題があった。
【０００４】
【発明が解決しようとする課題】
本発明は、従来技術では不十分であった耐擦過性を向上させ、より良好な保護性能を付与せしめうる熱転写シートを提供するものである。
【０００５】
【課題を解決するための手段】
本発明は、受像体上に形成された画像の耐擦過性を大幅に向上させるため、無機層状化合物を保護層中に添加することにより、飛躍的に画像保護性能を向上させることに成功したものである。
【０００６】
すなわち、本発明は、（１）受像体上に熱転写法により形成された熱溶融型画像上に保護層を転写するための熱転写シートであって、基材上に、熱転写性の保護層を有し、保護層が無機層状化合物とバインダーを主要成分とし、バインダーがワックス類及び樹脂類からなりワックス類を主成分とし、無機層状化合物の含有量がバインダー１００重量部に対し、２０〜１００重量部であり、保護層の厚さが０．５〜６μｍであることを特徴とする熱転写シートを提供する。
【００１１】
【発明の実施の形態】
以下に本発明を詳細に説明する。
【００１２】
本発明の熱転写シートにおける保護層は、無機層状化合物とバインダーを主要成分とし、バインダーはワックス類および樹脂類からなるものである。無機層状化合物はバインダー中でへき開し、扁平な薄片が一片一片ランダムに塗布面と平行に平板状態で高密度に微分散している。この形態での微分散が、無機層状化合物を添加していないワックスまたは樹脂による保護層や、シリカのような球状あるいは不定形粒子を分散した保護層に比較して、外部からのストレスによるインク層破壊に対して極めて強靱な保持力を発揮する。その結果、耐擦過性の良好な保護層を得ることができる。
【００１３】
本発明の熱転写シートの基材としては、膜厚２．５〜６μｍのポリエステルフィルム等のプラスチックフィルムが特に好ましい。基材の裏面にはスティック防止層を設けるのが好ましい。前記基材上に本発明の特徴とする保護層が設けられる。
【００１４】
保護層のバインダー成分としては、パラフィンワックス、カルナバワックス、キャンデリラワックス、モンタンワックス、ポリエチレンワックス、マレイン化ワックス等のワックス類、エチレン重合体あるいはプロピレン重合体およびこれらの共重合体等のオレフィン系樹脂ならびに変性オレフィン系樹脂、塩化ビニリデン系樹脂、スチレン系樹脂、（メタ）アクリル酸エステル系重合体および共重合体、ポリビニルブチラール等のアセタール樹脂、セルロース誘導体等の樹脂類があげられるが、これらに限定されるものではない。またこれらのワックス類及び樹脂類は２種以上を混合して用いることもできる。
【００１５】
無機層状化合物としては、タルク、モンモリロナイト、リン酸ジルコニウム、テニオライト、サポナイト、ヘクトライト、ゼオライト、チタン酸塩（Ｋ2Ｔｉ4Ｏ9）、ニオブ酸塩（Ｋ4Ｎｂ6Ｏ17）、グラファイト、硫化物（ＭｏＳ2）および、白雲母、ソーダ雲母、燐雲母、さらには、合成スメクタイト、フッ素系、珪素系等の膨張性、非膨張性の合成雲母等を使用できる。保護層中における無機層状化合物の粒径が小さすぎると、保護機能が低下し、耐擦過性が低下する傾向があり、一方大きすぎると、熱転写後の保護層の表面の平滑性が低下し、光沢感がなくなる傾向がある。この点から、保護層中における無機層状化合物は平均粒径が０．５〜２５μｍの範囲にあるものが好ましい。ここで、無機層状化合物の平均粒径はレーザーによる光散乱法により測定された値をいう。
【００１６】
本発明においては、前記無機層状化合物が、平均粒径が異なる２種以上の無機層状化合物からなるのが、保護性能の点から好ましい。図１はこの実施態様の１実施例の概略部分断面図である。図１において、１は基材であり、基材１のうえに保護層２が設けられており、保護層２中に平均粒径が異なる無機層状化合物３、４が分散されている。無機層状化合物３は平均粒径が小さな無機層状化合物に属するものであり、無機層状化合物４は平均粒径が大きな無機層状化合物に属するものである。この実施態様において保護性能がとりわけ良好である理由は定かではないが、図１に示されるように、大きさの異なる無機層状化合物３、４が混在した方が、単一の平均粒径の無機層状化合物単独の場合よりも、保護層の平面方向に、緻密に無機層状化合物が並ぶからと考えられる。それにより画像の保護機能がより向上する。
【００１７】
前記実施態様においては、前記平均粒径が異なる２種以上の無機層状化合物が、その全量に対して、平均粒径が０．５μｍ以上、５μｍ未満の無機層状化合物Ａ（無機層状化合物Ａはこの平均粒径の範囲内で平均粒径が異なる２種以上の無機層状化合物からなっていてもよい）を６０〜９５重量％含み、かつ平均粒径が５μｍ以上、２５μｍ以下の無機層状化合物Ｂ（無機層状化合物Ｂはこの平均粒径の範囲内で平均粒径が異なる２種以上の無機層状化合物からなっていてもよい）を５〜４０重量％含むのがより好ましい。平均粒径が５μｍ以上、２５μｍ以下の無機層状化合物Ｂの割合が４０重量％を超えると、熱転写後の保護層の表面が凹凸となり、印字品位を損なう等の不具合が発生する傾向がある。一方、平均粒径が５μｍ以上、２５μｍ以下の無機層状化合物Ｂの割合が５重量％未満となると、保護層中に平均粒径が異なる少なくとも２種以上の無機層状化合物を含むことによる緻密に無機層状化合物が並ぶという効果が得られない傾向がある。この実施態様においては、さらに、前記平均粒径が異なる２種以上の無機層状化合物Ａ、Ｂの間の平均粒径の差が５μｍ以上であり、粒径分布曲線が複数のピーク形状となることが好ましい。たとえば、前記平均粒径が０．５μｍ以上、５μｍ未満の無機層状化合物Ａが粒径分布曲線において単一のピーク形状を示すものであり、前記平均粒径が５μｍ以上、２５μｍ以下の無機層状化合物Ｂが粒径分布曲線において単一のピーク形状を示すものである場合、それらの平均粒径の差が５μｍ以上あるのが好ましい。また、前記平均粒径が５μｍ以上、２５μｍ以下の無機層状化合物Ｂがこの平均粒径の範囲内で平均粒径が異なる２種の無機層状化合物Ｂ１（粒径分布曲線において単一のピーク形状を示す、平均粒径が小さい）と無機層状化合物Ｂ２（粒径分布曲線において単一のピーク形状を示す、平均粒径が大きい）からなっていている場合、無機層状化合物Ａと無機層状化合物Ｂ１の平均粒径の差が５μｍ以上であり、無機層状化合物Ｂ１と無機層状化合物Ｂ２の平均粒径の差が５μｍ以上であるのが好ましい。
【００１８】
保護層中における無機層状化合物の含有量は、バインダー１００重量部に対し、とくに２０〜１００重量部の範囲が好ましい。無機層状化合物の含有量が前記範囲未満では、無機層状化合物の含有による画像保護の向上が良好に発現出来ない。一方、無機層状化合物の含有量が前記範囲を超えると、転写不良を起こす傾向がある。保護層の厚さが０．５μｍ未満であると画像の保護機能が低下する。前記厚さが６μｍを超えると転写感度が低下し、全ベタ転写が困難になる傾向がある。
【００１９】
保護層には、必要に応じて蛍光増白剤、紫外線吸収剤、界面活性剤等を本発明の目的を損なわない範囲内で適宜添加してもよい。
【００２０】
保護層は、画像の色相を変えないために、実質的に無色透明であることが望ましい。しかし、画像全体の色調を変えるために、保護層を淡色に着色しても良い。保護層の着色には、公知の顔料、染料、金属粉等を保護層に含有させればよい。
【００２１】
本発明の熱転写シートは、基材上に前記保護層のみを設けた構成のものであってもよく、あるいは同一基材上に保護層と共に着色インク層を設けた構成のものであってもよい。後者の場合、同一基材上に保護層と１色または２色以上の着色インク層（たとえばイエロー、マゼンタ、シアンのインク層）を順次繰返し並べて設けた構成のものがあげられる。この熱転写シートを使用すると、受像体上に複数色の着色インク層を転写して多色またはフルカラーの画像を形成後同一熱転写工程で画像上に保護層を転写できる。
【００２２】
【実施例】
つぎに実施例をあげて本発明をさらに詳細に説明する。
【００２３】
実施例１〜５および比較例１〜２
下記処方の保護層インクを調製し、裏面にスティック防止処理を施した厚さ４．５μｍのポリエチレンテレフタレートフィルム上にホットメルト法にて塗布厚さ４μｍで塗布し、熱転写シートを得た。下記処方において、略称名はつぎのものを意味する。
ＥＶＡ：エチレン−酢酸ビニル共重合体
ＶＡ：酢酸ビニル
【００２４】
下記受像紙上に、下記熱転写プリンターにて、該プリンター専用のカラーインクリボンを使ってカラー画像を形成後、前記で得られた熱転写シートを用いて保護層を転写し、下記評価方法で保護性能の評価を行った。
【００２５】
＜印画条件＞
プリンター：セイコーインスツルメンツ（株）製Ｃｏｌｏｒ Ｐｏｉｎｔ １６３５
受像紙：前記プリンター専用紙（ＣＨ−８９６）
【００３３】
＜評価方法＞
それぞれの保護層を転写したカラー画像上を加重５００ｇ／ｃｍ2にて綿布を５０往復させる耐ストレス試験（試験機：クロックメーター）を行い、カラー画像の損傷程度を目視観察し、各保護層による画像保護効果を下記の基準で比較評価した。結果を表１に示す。
○：画像損傷無し
△：やや画像損傷あり
×：画像損傷が激しい
【００３４】
【表１】
表１に示されるごとく、実施例では、３０往復でもカラー画像の損傷は無かった。一方、比較例１では、１５往復程度で画像損傷が始まった。比較例２では、１０往復程度で画像損傷が始まった。
【００３６】
【発明の効果】
本発明の熱転写シートにより、熱転写法により良好な保護特性を画像表面に付与することができる。
【図面の簡単な説明】
【図１】本発明の熱転写シートの１実施例を示す概略部分断面図である。
【符号の説明】
１ 基材
２ 保護層
３、４ 無機層状化合物[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to an overprint technique for improving the scratch resistance and the like of an image transferred onto an image receiving member in the field of thermal transfer recording.
[0002]
[Prior art]
A technique for overprinting a protective layer made of waxes and / or resins, or a protective layer having particles added therein as an image protective layer on a color image formed on a receiver is known.
[0003]
However, not only transparent ink layers made of waxes and / or resins, but also when particles are added, the scratch resistance deteriorates due to the inherent softness of the wax or the inherent tackiness of the resin, resulting in sufficient image protection There was a problem that the effect could not be demonstrated.
[0004]
[Problems to be solved by the invention]
The present invention provides a thermal transfer sheet that can improve scratch resistance, which has been insufficient in the prior art, and can impart better protection performance.
[0005]
[Means for Solving the Problems]
The present invention has succeeded in dramatically improving the image protection performance by adding an inorganic layered compound to the protective layer in order to greatly improve the scratch resistance of the image formed on the image receptor. It is.
[0006]
That is, the present invention is (1) a thermal transfer sheet for transferring a protective layer onto a heat-melt type image formed on a receiver by a thermal transfer method, and having a thermal transferable protective layer on a substrate. The protective layer comprises an inorganic layered compound and a binder as main components, the binder is composed of waxes and resins, the wax is the main component, and the content of the inorganic layered compound is 20 to 100 parts by weight with respect to 100 parts by weight of the binder. The thermal transfer sheet is characterized in that the thickness of the protective layer is 0.5 to 6 μm .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is described in detail below.
[0012]
Protective layer in the thermal transfer sheet of the present invention, the inorganic layered compound and the binder as the main component, the binder is made of beauty resins such Oyo waxes. The inorganic layered compound is cleaved in the binder, and the flat flakes are finely dispersed in a flat state in a flat state parallel to the coating surface. The fine dispersion in this form is an ink layer due to external stress compared to a protective layer made of wax or resin to which an inorganic layered compound is not added, or a protective layer in which spherical or amorphous particles such as silica are dispersed. Demonstrates extremely strong holding power against destruction. As a result, a protective layer having good scratch resistance can be obtained.
[0013]
As a base material of the thermal transfer sheet of the present invention, a plastic film such as a polyester film having a film thickness of 2.5 to 6 μm is particularly preferable. A stick prevention layer is preferably provided on the back surface of the substrate. A protective layer, which is a feature of the present invention, is provided on the substrate.
[0014]
Examples of the binder component of the protective layer include waxes such as paraffin wax, carnauba wax, candelilla wax, montan wax, polyethylene wax, maleated wax, and olefin resins such as ethylene polymer or propylene polymer and copolymers thereof. And modified olefin resins, vinylidene chloride resins, styrene resins, (meth) acrylic acid ester polymers and copolymers, acetal resins such as polyvinyl butyral, and resins such as cellulose derivatives. Is not to be done. These waxes and resins can be used in combination of two or more.
[0015]
Inorganic layered compounds include talc, montmorillonite, zirconium phosphate, teniolite, saponite, hectorite, zeolite, titanate (K 2 Ti 4 O 9 ), niobate (K 4 Nb 6 O 17 ), graphite, sulfide In addition, a product (MoS 2 ), muscovite, soda mica, phosphomica, synthetic smectite, fluorine-based, silicon-based, and other expansive and non-expandable synthetic mica can be used. If the particle size of the inorganic layered compound in the protective layer is too small, the protective function tends to decrease and the scratch resistance tends to decrease, while if too large, the surface smoothness of the protective layer after thermal transfer decreases, There is a tendency to lose glossiness. From this point, the inorganic layered compound in the protective layer preferably has an average particle size in the range of 0.5 to 25 μm. Here, the average particle diameter of the inorganic layered compound refers to a value measured by a light scattering method using a laser.
[0016]
In the present invention, the inorganic layered compound is preferably composed of two or more inorganic layered compounds having different average particle diameters from the viewpoint of protective performance. FIG. 1 is a schematic partial sectional view of an example of this embodiment. In FIG. 1, 1 is a base material, a protective layer 2 is provided on the base material 1, and inorganic
[0017]
In the above embodiment, the inorganic layered compound A having an average particle size of 0.5 μm or more and less than 5 μm with respect to the total amount of the two or more inorganic layered compounds having different average particle sizes is Inorganic layered compound B (containing 60 to 95% by weight) (which may be composed of two or more inorganic layered compounds having different average particle sizes within the range of the average particle size) and having an average particle size of 5 μm or more and 25 μm or less More preferably, the inorganic layered compound B contains 5 to 40% by weight of an inorganic layered compound (which may be composed of two or more inorganic layered compounds having different average particle sizes within the range of the average particle size). When the ratio of the inorganic layered compound B having an average particle diameter of 5 μm or more and 25 μm or less exceeds 40% by weight, the surface of the protective layer after thermal transfer becomes uneven, and there is a tendency that problems such as impaired print quality occur. On the other hand, when the proportion of the inorganic layered compound B having an average particle size of 5 μm or more and 25 μm or less is less than 5% by weight, the protective layer contains a dense inorganic material by containing at least two kinds of inorganic layered compounds having different average particle sizes. There is a tendency that the effect that the layered compounds are arranged cannot be obtained. In this embodiment, the difference in the average particle size between the two or more inorganic layered compounds A and B having different average particle sizes is 5 μm or more, and the particle size distribution curve has a plurality of peak shapes. Is preferred. For example, the inorganic layered compound A having an average particle diameter of 0.5 μm or more and less than 5 μm exhibits a single peak shape in a particle size distribution curve, and the inorganic layered compound has an average particle diameter of 5 μm or more and 25 μm or less. When B shows a single peak shape in the particle size distribution curve, the difference in average particle size is preferably 5 μm or more. Further, the inorganic layered compound B having an average particle size of 5 μm or more and 25 μm or less has two kinds of inorganic layered compounds B1 having different average particle sizes within the range of the average particle size (single peak shape in the particle size distribution curve). The average particle size is small) and the inorganic layered compound B2 (indicating a single peak shape in the particle size distribution curve, the average particle size is large), the inorganic layered compound A and the inorganic layered compound B1 The difference in average particle diameter is preferably 5 μm or more, and the difference in average particle diameter between the inorganic layered compound B1 and the inorganic layered compound B2 is preferably 5 μm or more.
[0018]
The content of the inorganic layered compound in the protective layer is 100 parts by weight of the binder with respect to, particularly preferably in the range of 20 to 100 parts by weight. When the content of the inorganic layered compound is less than the above range, the improvement in image protection due to the inclusion of the inorganic layered compound cannot be exhibited well. On the other hand, when the content of the inorganic layered compound exceeds the above range, there is a tendency to cause transfer failure. When the thickness of the protective layer is less than 0.5 μm, the image protection function is lowered. When the thickness exceeds 6 μm, the transfer sensitivity is lowered, and there is a tendency that full solid transfer becomes difficult.
[0019]
You may add suitably a fluorescent whitening agent, a ultraviolet absorber, surfactant, etc. to a protective layer in the range which does not impair the objective of this invention as needed.
[0020]
The protective layer is preferably substantially colorless and transparent so as not to change the hue of the image. However, in order to change the color tone of the entire image, the protective layer may be colored lightly. In order to color the protective layer, a known pigment, dye, metal powder or the like may be contained in the protective layer.
[0021]
The thermal transfer sheet of the present invention may have a configuration in which only the protective layer is provided on a substrate, or may have a configuration in which a colored ink layer is provided together with a protective layer on the same substrate. . In the latter case, a protective layer and one or two or more colored ink layers (for example, yellow, magenta, and cyan ink layers) are sequentially and repeatedly arranged on the same substrate. When this thermal transfer sheet is used, a multi-color or full-color image is formed by transferring a plurality of colored ink layers on the image receiver, and then a protective layer can be transferred onto the image in the same thermal transfer step.
[0022]
【Example】
Next, the present invention will be described in more detail with reference to examples.
[0023]
Examples 1-5 and Comparative Examples 1-2
A protective layer ink having the following formulation was prepared, and applied on a polyethylene terephthalate film having a thickness of 4.5 μm with a stick prevention treatment on the back surface by a hot melt method to a coating thickness of 4 μm to obtain a thermal transfer sheet. In the following prescription, the abbreviation name means the following.
EVA: ethylene-vinyl acetate copolymer VA: vinyl acetate
On the following image receiving paper, after forming a color image with the following thermal transfer printer using the color ink ribbon dedicated to the printer, the protective layer is transferred using the thermal transfer sheet obtained above, and the protective performance of the following evaluation method is used. Evaluation was performed.
[0025]
<Printing conditions>
Printer: Color Point 1635 manufactured by Seiko Instruments Inc.
Image receiving paper: Paper for printer (CH-896)
[0033]
<Evaluation method>
A stress resistance test (testing machine: clock meter) in which a cotton cloth is reciprocated 50 times at a weight of 500 g / cm 2 on the color image to which each protective layer is transferred is performed, and the degree of damage of the color image is visually observed. The image protection effect was compared and evaluated according to the following criteria. The results are shown in Table 1.
○: No image damage Δ: Some image damage ×: Image damage is severe [0034]
[Table 1]
As shown in Table 1, in the example, the color image was not damaged even after 30 reciprocations. On the other hand, in Comparative Example 1, image damage started after about 15 reciprocations. In Comparative Example 2, image damage started after about 10 reciprocations.
[0036]
【The invention's effect】
With the thermal transfer sheet of the present invention, good protective properties can be imparted to the image surface by a thermal transfer method.
[Brief description of the drawings]
FIG. 1 is a schematic partial sectional view showing one embodiment of a thermal transfer sheet of the present invention.
[Explanation of symbols]
1 Base material 2
Claims (1)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000027994A JP4332825B2 (en) | 1999-09-27 | 2000-02-04 | Protective layer transfer sheet |
| US09/775,296 US20010016558A1 (en) | 2000-02-04 | 2001-01-31 | Thermal transfer sheet for transferring protective layer |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11-272458 | 1999-09-27 | ||
| JP27245899 | 1999-09-27 | ||
| JP2000027994A JP4332825B2 (en) | 1999-09-27 | 2000-02-04 | Protective layer transfer sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001162932A JP2001162932A (en) | 2001-06-19 |
| JP4332825B2 true JP4332825B2 (en) | 2009-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000027994A Expired - Lifetime JP4332825B2 (en) | 1999-09-27 | 2000-02-04 | Protective layer transfer sheet |
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| Country | Link |
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| JP (1) | JP4332825B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7361247B2 (en) * | 2003-12-31 | 2008-04-22 | Neenah Paper Inc. | Matched heat transfer materials and method of use thereof |
| US7435463B2 (en) | 2005-07-29 | 2008-10-14 | Fujicopian Co., Ltd. | Transfer medium for transferring protective layer |
| JP4686686B2 (en) * | 2005-12-02 | 2011-05-25 | フジコピアン株式会社 | Protective layer transfer sheet |
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2000
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| JP2001162932A (en) | 2001-06-19 |
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