JP2006007438A - Self-adhesive sheet for image recording - Google Patents

Self-adhesive sheet for image recording Download PDF

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Publication number
JP2006007438A
JP2006007438A JP2004183900A JP2004183900A JP2006007438A JP 2006007438 A JP2006007438 A JP 2006007438A JP 2004183900 A JP2004183900 A JP 2004183900A JP 2004183900 A JP2004183900 A JP 2004183900A JP 2006007438 A JP2006007438 A JP 2006007438A
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sensitive adhesive
layer
pressure
sheet
image recording
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Toshiharu Ozaki
俊晴 尾崎
Yutaka Kawamura
豊 川村
Atsushi Matsui
敦 松井
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New Oji Paper Co Ltd
Oji Tac Co Ltd
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Oji Paper Co Ltd
Oji Tac Co Ltd
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Priority to JP2004183900A priority Critical patent/JP2006007438A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-adhesive sheet for direct thermosensitive image recording of favorable adhesion which generates less color slur of respective color image developing at the recording of a multicolor image and, in addition, allows no paste swells out. <P>SOLUTION: In the self-adhesive sheet for direct thermosensitive image recording, which consists of a sheet having a self-adhesive layer on the surface opposite to a direct thermosensitive image recording sheet consisting of an image recording layer and a support and a release sheet having a releasant layer on one side of a foamed polyester film and a printing easily bonding receiving layer on its other side under the condition being laminated both the sheets together so as to face the releasant layer and the self-adhesive layer each other, the values of the loss tangent tanδ(5) at 5°C and of the loss tangent tanδ(40) at 40°C of the self-adhesive layer lie between 0.4 and 0.8. At the same time, the gel fraction of the self-adhesive is set to be 60-66 mass%. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、デジタルカメラ,スキャナー,コンピューターによる画像等をフルカラー画像として出力する画像プリントシステムの内、熱を利用して画像を記録するプリント方式である直接感熱画像記録方式に好適に用いられ、被着体に貼付可能な粘着シートに関し、さらに詳しくはサーマルヘッドを利用して多色画像等を連続階調で記録媒体に記録する際に生ずる各色画像の位置ずれを少なくするのに有用な直接感熱画像記録用粘着シートに関する。 The present invention is preferably used in a direct thermal image recording system that is a printing system that records an image using heat, among image printing systems that output digital camera, scanner, and computer images as full-color images. Direct adhesive that is useful for reducing misalignment of each color image that occurs when a multi-color image or the like is recorded on a recording medium in a continuous tone using a thermal head. The present invention relates to an adhesive sheet for image recording.

近年、画像形成技術の進歩により、(1)イエロー(2)マゼンタ(3)シアンの各色をサーマルヘッド等の発熱素子から熱エネルギーを印加して直接発色させる直接感熱記録方式、(2)熱エネルギーを印加して色素を昇華させて画像形成層に転写する昇華熱転写記録方式、(3)熱エネルギーを印加して溶融したインクを転写して画像形成する溶融型熱転写方式や(4)静電転写方式によりトナーで画像形成層に画像を形成し、熱で溶融・冷却して画像を固定する電子写真方式等の高度な印画方式により写真に近い画質を得ることが可能となってきており、これに粘着シートの構成とすることで、画像記録された後はシールとして被着体に貼り付けることが広く一般に普及している。 In recent years, with the advancement of image forming technology, (1) yellow (2) magenta (3) direct thermal recording system in which each color of cyan is directly colored by applying thermal energy from a heating element such as a thermal head, (2) thermal energy Sublimation thermal transfer recording method in which dye is sublimated and transferred to an image forming layer, (3) a melt type thermal transfer method in which heat energy is applied to transfer molten ink to form an image, and (4) electrostatic transfer It has become possible to obtain an image quality close to a photograph by an advanced printing method such as an electrophotographic method in which an image is formed on the image forming layer with toner according to the method, and the image is fixed by melting and cooling with heat. With the configuration of the pressure-sensitive adhesive sheet, it is widely spread that it is affixed to an adherend as a seal after image recording.

特に、熱を利用する直接感熱画像記録方式の場合は、記録シート自体が温度変化にさらされることから、熱の影響により色ずれを生ずる問題があった。
また、この現象はプリンターの設置環境が低温である場合ほど著しく、5℃といった低温で鮮明な画像が得られないことが多い。また、近年の高画質化の流れに伴ってプリンターの高解像化が進み、印画時に各色の位置ズレが少なく品質の高い画像が益々市場から求められるようになっており、鮮明で色相に優れた多色画像を形成できる直接感熱画像記録用粘着シートの開発が重要となってきている。
これを解決するため、例えば、特開2002−180018号公報(特許文献1)には、使用環境温度下における剥離シートを粘着剤層から剥離する際の剥離力の最大値(Nmax)と最小値(Nmin)との比が3.5以下(好ましくは2.0以下)である粘着記録シートが提案されている。
しかしながら、特開2002−180018号公報の技術では、剥離力と色ずれとの関連が不明であり、色ずれと直接関係のない剥離力を規定するものであり、十分な効果が得られるものではなかった。
特開2002−180018号公報
In particular, in the case of the direct thermal image recording system using heat, the recording sheet itself is exposed to a temperature change, so that there is a problem that color shift occurs due to the influence of heat.
In addition, this phenomenon is more remarkable when the printer is installed at a low temperature, and a clear image is often not obtained at a low temperature of 5 ° C. In addition, with the recent trend toward higher image quality, printer resolution has increased, and high-quality images with less positional displacement of each color during printing are increasingly demanded from the market. In addition, it has become important to develop an adhesive sheet for direct thermal image recording that can form multicolor images.
In order to solve this, for example, Japanese Patent Application Laid-Open No. 2002-180018 (Patent Document 1) describes the maximum value (Nmax) and the minimum value of the peeling force when peeling the release sheet from the pressure-sensitive adhesive layer under the use environment temperature. An adhesive recording sheet having a ratio to (Nmin) of 3.5 or less (preferably 2.0 or less) has been proposed.
However, in the technique of Japanese Patent Application Laid-Open No. 2002-180018, the relationship between the peeling force and the color shift is unknown, and the peeling force that is not directly related to the color shift is specified, and a sufficient effect cannot be obtained. There wasn't.
Japanese Patent Laid-Open No. 2002-180018

本発明は、上記課題を解決するためになされたものであって、いずれの印画方式においても、多色の画像を記録(印画)する場合には、各色を順次形成して多色(フルカラー)とすることが多いが、その際にプリンター内の画像記録シートの走行にずれを生じず、各色の位置ズレが発生しない、さらに画像がぼやけたり、あるいは色合いの変化が発生しない粘着シートを提供することを目的とする。   The present invention has been made in order to solve the above-described problem. In any printing system, when recording (printing) a multicolor image, each color is sequentially formed to produce a multicolor (full color). In this case, there is provided a pressure-sensitive adhesive sheet that does not cause a shift in the running of the image recording sheet in the printer, does not cause misregistration of each color, further blurs an image, or does not change a hue. For the purpose.

本発明者は、プリンター搬送系における色ずれの機構を鋭意研究した結果、プリンター走行時の温度変化により記録シート自体の損失正接tanδの変化、特に粘着剤を塗布した直接感熱記録用表面シート/粘着剤/剥離シートからなる画像記録用粘着シートの場合、粘着剤の損失正接tanδの変化と粘着剤の架橋度を表すゲル分率が色ずれに大きく寄与していることを見いだし、本発明の直接感熱画像記録用粘着シートを完成するに至った。
ここで言う損失正接tanδは、損失弾性率G’’と貯蔵弾性率G’との比であり、失われるエネルギーと保存されるエネルギーの比を表している。即ちtanδの値が大きいほど粘性体に近くエネルギーを吸収しやすい粘着剤であり、tanδの値が小さいほど弾性体に近い粘着剤となる。
As a result of earnest research on the mechanism of color misregistration in the printer conveyance system, the present inventor has found that the loss tangent tan δ of the recording sheet itself changes due to the temperature change during running of the printer, in particular, the surface sheet for direct thermal recording / adhesive coated with an adhesive. In the case of the pressure-sensitive adhesive sheet for image recording composed of the adhesive / release sheet, it was found that the change in the loss tangent tan δ of the pressure-sensitive adhesive and the gel fraction representing the degree of crosslinking of the pressure-sensitive adhesive greatly contributed to the color shift. The adhesive sheet for thermal image recording has been completed.
The loss tangent tan δ here is a ratio between the loss elastic modulus G ″ and the storage elastic modulus G ′, and represents the ratio of lost energy to stored energy. That is, the larger the value of tan δ, the closer to the viscous body, the easier it is to absorb energy, and the smaller the value of tan δ, the closer to the elastic body.

本発明は、この粘着剤の損失正接tanδの値が、5℃における損失正接tanδ(5)と40℃における損失正接tanδ(40)が0.4〜0.8にある場合、画像記録用シートとして好適な粘着性能を得ることが出来、粘着剤の損失正接の変化が少ないことで記録される各色画像の色ずれを少なくできることを見いだしたものである。
即ち、tanδの値が粘着シートの使用領域である5℃または40℃で、0.4より小さい場合は各種被着体への接着性に乏しくなる。また、0.8より大きい場合はプリンター内部の搬送系において厚さ方向にかかる応力を熱エネルギーに変えて応力緩和するため、粘着剤の変形が大きくなることで該粘着シートの厚さ方向の変化が大きくなり、プリンターの搬送距離や搬送抵抗の変化を生じ各色画像の位置ズレを生ずることがある。
In the present invention, when the value of the loss tangent tan δ (5) at 5 ° C. and the loss tangent tan δ (40) at 40 ° C. are 0.4 to 0.8, As a result, it has been found that suitable adhesive performance can be obtained, and that the color shift of each color image recorded can be reduced due to a small change in loss tangent of the adhesive.
That is, when the value of tan δ is less than 0.4 at 5 ° C. or 40 ° C. where the pressure sensitive adhesive sheet is used, the adhesion to various adherends becomes poor. Also, if it is larger than 0.8, the stress applied in the thickness direction in the transport system inside the printer is changed to thermal energy to relieve the stress, so that the deformation of the adhesive increases and the change in the thickness direction of the adhesive sheet May increase, causing a change in the conveyance distance and conveyance resistance of the printer, resulting in misalignment of each color image.

また、記録される各色画像の位置ズレを制御するには、温度変化に伴う記録シートの損失正接tanδの変化を抑えることが重要であり、特に記録用粘着シートの場合は粘着剤の損失正接tanδの温度変化を小さくすることが重要である。 Further, in order to control the positional deviation of each color image to be recorded, it is important to suppress the change in the loss tangent tan δ of the recording sheet due to the temperature change, and particularly in the case of the recording adhesive sheet, the loss tangent tan δ of the adhesive. It is important to reduce the temperature change.

粘着剤のtanδは、組成により変化させることが可能で、モノマー配合によりガラス転移温度(Tg)を下げる、タッキファイヤーを添加する等、粘性を高めることでtanδを上げることが出来る。一方、ガラス転移温度(Tg)を上げることやタッキファイヤーを入れないことで粘着剤の弾性が高まり、tanδを下げることが出来る。
具体的には、粘着剤の5℃における損失正接tanδ(5)と40℃における損失正接tanδ(40)との比率Tが1.5以下となるように粘着剤の分子量及び分子の分岐を調整することで色ズレを抑えることが出来る。
また、tanδの温度依存性を無くすには、分子量を上げて分子の分岐を少なくすることが有効だが、粘着力が下がる傾向にあるため、粘着性能と記録される各色画像の位置ズレのバランスをとることが重要である。
The tan δ of the pressure-sensitive adhesive can be changed depending on the composition, and tan δ can be increased by increasing the viscosity such as lowering the glass transition temperature (Tg) by adding a monomer or adding a tackifier. On the other hand, by increasing the glass transition temperature (Tg) or not using a tackifier, the elasticity of the pressure-sensitive adhesive increases and tan δ can be decreased.
Specifically, the molecular weight and molecular branching of the pressure-sensitive adhesive are adjusted so that the ratio T between the loss tangent tan δ (5) at 5 ° C. and the loss tangent tan δ (40) at 40 ° C. is 1.5 or less. By doing so, color shift can be suppressed.
In order to eliminate the temperature dependence of tan δ, it is effective to increase the molecular weight and reduce the molecular branching. However, since the adhesive force tends to decrease, the balance between the adhesive performance and the positional deviation of each color image to be recorded is balanced. It is important to take.

比率Tが1.5を超える場合は、粘着剤層の温度による厚さ方向のクッション性の変化が大きくなり、直接感熱方式の画像記録においては、搬送距離や搬送抵抗の変化が大きくなることで色ズレが大きくなり不適である。 When the ratio T exceeds 1.5, the change in the cushioning property in the thickness direction due to the temperature of the pressure-sensitive adhesive layer increases, and in direct thermal image recording, the change in the conveyance distance and conveyance resistance increases. Color misregistration increases and is not suitable.

さらに、各色画像の位置ズレを制御するためには、表面基材の直接感熱記録シート及び剥離シートの材質に合わせて、粘着剤の架橋度を示すゲル分率を60〜66質量%の範囲で調整する必要がある。
ここで言うゲル分率は、ソックスレー抽出器を用い、1g前後の粘着剤を酢酸エチルにより重量変化が無くなるまで、酢酸エチルの沸点で抽出し、残った粘着剤の残査(W1)と元の粘着剤の質量(W0)の比を測定した値である。

ゲル分率(質量%)=W1/W0×100
Furthermore, in order to control the positional deviation of each color image, the gel fraction indicating the degree of crosslinking of the adhesive is in the range of 60 to 66% by mass in accordance with the material of the direct thermal recording sheet and release sheet of the surface substrate. It needs to be adjusted.
The gel fraction referred to here is obtained by using a Soxhlet extractor and extracting about 1 g of the adhesive with ethyl acetate at the boiling point of ethyl acetate until there is no weight change, and the remaining adhesive (W1) and the original adhesive It is the value which measured ratio of the mass (W0) of an adhesive.

Gel fraction (mass%) = W1 / W0 × 100

本発明に係る直接感熱画像記録用粘着シートにより、画像の色ズレが少なく、鮮明なデジタル写真の品質を得ることが出来る。   With the pressure-sensitive adhesive sheet for direct thermal image recording according to the present invention, it is possible to obtain clear digital photograph quality with little image color shift.

以下に、本発明を詳細に説明する。
本発明の表面シートとしては、例えば、富士写真フイルム(株)製の直接感熱画像記録用シートであるPrintpixペーパーを用い、粘着剤としては、粘着剤層の5℃における損失正接tanδ(5)と40℃における損失正接tanδ(40)の値が、0.4〜0.8の間にある特定のアクリル系粘着剤、剥離シートとしては、スキン層/発泡層/スキン層/印刷易接着受理層をもつ東洋紡績(株)製のクリスパーK5312 100μmの易接着受理層と反対面にシリコーン系剥離剤を塗布したものを用いた場合、粘着剤層のゲル分率を60〜66質量%に調整したものが、富士写真フイルム(株)製のPrintpixプリンター NC−370DおよびNC−471Dで印画した場合、記録される各色画像の位置ズレが最も小さくなる。
The present invention is described in detail below.
As the surface sheet of the present invention, for example, Printpix paper, which is a direct thermal image recording sheet manufactured by Fuji Photo Film Co., Ltd., is used, and the pressure-sensitive adhesive layer has a loss tangent tanδ (5) at 5 ° C. A specific acrylic pressure-sensitive adhesive having a loss tangent tan δ (40) value at 40 ° C. of 0.4 to 0.8, as a release sheet, skin layer / foamed layer / skin layer / printable adhesive receiving layer When a silicone release agent was applied on the opposite side of the 100 μm easy-adhesion receiving layer of Toyobo Co., Ltd. manufactured by Toyobo Co., Ltd., the gel fraction of the pressure-sensitive adhesive layer was adjusted to 60 to 66% by mass. When an object is printed by the Printpix printers NC-370D and NC-471D manufactured by Fuji Photo Film Co., Ltd., the positional deviation of each color image to be recorded becomes the smallest.

また、表面基材として、富士写真フイルム(株)製Printpixペーパーを用い、粘着剤として粘着剤層の5℃における損失正接tanδ(5)と40℃における損失正接tanδ(40)の値が0.4〜0.8の間にある特定のアクリル系粘着剤、剥離シートとしてスキン層を持たない片面印刷易接着受理層を持つ東洋紡績(株)製クリスパーG5312の易接着受理層と反対面にシリコーン系剥離剤を塗布したものを用いた場合は、62〜64質量%のゲル分率のものが、富士写真フイルム(株)製Printpixプリンター NC−370DおよびNC−471Dで印画した場合、最も記録される各色画像の位置ズレが小さくなる。
ゲル分率が60質量%未満の場合は粘着剤の架橋度が低いことにより凝集力が不足し、粘着シートからの糊のはみ出しによりプリンターのサーマルヘッドやペーパーロール等を汚すおそれがある。また、ゲル分率が66質量%を超える場合は、架橋度が高すぎるため接着性が損なわれるという不都合が生ずるおそれがある。
Further, Printpix paper manufactured by Fuji Photo Film Co., Ltd. was used as the surface substrate, and the values of the loss tangent tan δ (5) at 5 ° C. and the loss tangent tan δ (40) at 40 ° C. of the pressure-sensitive adhesive layer were 0. Specific acrylic pressure-sensitive adhesive between 4 and 0.8, silicone on the opposite side of the easy-adhesion receiving layer of Toyobo Krisper G5312 having a single-sided printing easy-adhesion receiving layer without a skin layer as a release sheet In the case of using the one coated with a release agent, the one having a gel fraction of 62 to 64% by mass is recorded the most when printed with a Printpix printer NC-370D and NC-471D manufactured by Fuji Photo Film Co., Ltd. The positional deviation of each color image becomes smaller.
When the gel fraction is less than 60% by mass, the cohesive force is insufficient due to the low degree of crosslinking of the pressure-sensitive adhesive, and there is a possibility that the thermal head of the printer, paper roll, and the like are soiled by the sticking out of the pressure-sensitive adhesive sheet. On the other hand, when the gel fraction exceeds 66% by mass, the degree of cross-linking is too high, and there is a possibility that the adhesiveness is impaired.

本発明の粘着シートを構成する直接感熱記録用表面シートとしては、記録層と支持体からなる。支持体としては、公知の材料が使用でき、例えば紙類、合成樹脂フィルム、合成紙、不織布、紙の両面に樹脂ラミネートした所謂RC紙などが挙げられる。この中でも、RC紙が好適に用いられる。また、記録層としては、直接感熱記録等の記録方式に適した、例えば、特開昭60−242093号公報、特開昭61−40192公報等に記載されたジアゾ化合物の光分解性と、ジアゾ化合物とカプラーとのカップリング反応により発色する性質とを利用した感熱記録層を用いることが出来る。 The surface sheet for direct thermal recording constituting the pressure-sensitive adhesive sheet of the present invention comprises a recording layer and a support. As the support, known materials can be used, and examples thereof include papers, synthetic resin films, synthetic papers, non-woven fabrics, and so-called RC paper obtained by resin lamination on both sides of paper. Among these, RC paper is preferably used. Further, the recording layer is suitable for a recording method such as direct thermal recording, for example, the photodegradability of a diazo compound described in JP-A-60-242093 and JP-A-61-14021, and the diazo compound. A heat-sensitive recording layer utilizing the property of coloring by a coupling reaction between a compound and a coupler can be used.

本発明の粘着剤を構成する成分としては、(メタ)アクリル系樹脂を主成分とするアクリル系粘着剤であり、これに架橋剤を配合し、乾燥し、固化させて使用するのが好ましい。 The component constituting the pressure-sensitive adhesive of the present invention is an acrylic pressure-sensitive adhesive mainly composed of a (meth) acrylic resin, and it is preferable to mix a crosslinking agent with this, dry and solidify it.

粘着剤層のゲル分率を調整する架橋剤としては、イソシアネート系、エポキシ系、アジリジン系、カルポジイミド系および金属キレート系等を用いることができ、1種または2種以上を併用しても良い。その中でも、記録シートの支持体との密着性向上の面で、イソシアネート系およびエポキシ系が好ましい。 As the crosslinking agent for adjusting the gel fraction of the pressure-sensitive adhesive layer, isocyanate-based, epoxy-based, aziridine-based, carpositimide-based, metal chelate-based, and the like can be used, and one or two or more types may be used in combination. Among these, the isocyanate type and the epoxy type are preferable in terms of improving the adhesion of the recording sheet to the support.

本発明の粘着シートを構成する剥離シートとしては、基材と剥離剤の層からなる。基材としては、公知の材料が使用でき、平滑性と適度なクッション性を有し、且つ熱拡散率の低い発泡ポリエチレンテレフタレートフィルムが好ましい。
また、剥離剤としては、シリコーン系、フッ素系、アルキルペンダント系、縮合ワックス系のものが使用できるが、剥離紙からスムースに剥がれる点、及びプリンター走行中に剥がれを生じないようにするため、シリコーンレジンを配合した重剥離タイプのシリコーン系剥離剤が好適に使用できる。
The release sheet constituting the pressure-sensitive adhesive sheet of the present invention comprises a base material and a release agent layer. As the substrate, a known material can be used, and a foamed polyethylene terephthalate film having smoothness and appropriate cushioning properties and low thermal diffusivity is preferable.
As the release agent, silicone, fluorine, alkyl pendant, and condensed wax types can be used. However, in order to prevent the release paper from peeling off smoothly and to prevent peeling during printer running, silicone A heavy release type silicone release agent blended with a resin can be suitably used.

粘着剤層を形成する方法としては、(メタ)アクリル酸エステルを共重合させたアクリル系粘着剤に、架橋剤を添加した塗液を、剥離シート上に、塗布し、乾燥した後、記録シートの支持体側と貼り合わせて製造される。
また、粘着剤層の塗布装置としては、リバースロールコーター、ナイフコーター、コンマコーター、バーコーター、スロットダイコーター、バリオグラビアコーター、リップコーター、カーテンコーター等の公知の塗工装置が使用できる。
粘着剤の塗布量は、乾燥重量で5〜50g/mの塗布量あり、この中でも8〜25g/m2が好ましい。 塗布量が8g/m2未満では得られる記録シートの接着性能が不十分となるおそれがあり、25g/m2を超えると糊のはみ出し等によりプリンターの通紙不良を生ずるおそれがある。
As a method for forming the pressure-sensitive adhesive layer, a coating liquid obtained by adding a crosslinking agent to an acrylic pressure-sensitive adhesive copolymerized with (meth) acrylic acid ester is applied onto a release sheet, dried, and then recorded. It is manufactured by bonding to the support side.
Moreover, as a coating apparatus of an adhesive layer, well-known coating apparatuses, such as a reverse roll coater, a knife coater, a comma coater, a bar coater, a slot die coater, a vario gravure coater, a lip coater, a curtain coater, can be used.
The application amount of the pressure-sensitive adhesive is 5 to 50 g / m 2 by dry weight, and 8 to 25 g / m 2 is preferable among them. If the coating amount is less than 8 g / m 2 , the resulting recording sheet may have insufficient adhesive performance, and if it exceeds 25 g / m 2 , the printer may have poor paper passing due to sticking out of the paste.

(実施例1)
表面基材として富士写真フイルム(株)製の直接感熱画像記録用シートであるPrintpixペーパーを用い、粘着剤として、粘着剤層の5℃における損失正接tanδ(5)の値が0.76、40℃における損失正接tanδ(40)の値が0.62であり、5℃の損失正接tanδ(5)と40℃の損失正接tanδ(40)との比T=tanδ(5)/tanδ(40)が1.2である2−エチルヘキシルアクリレートを主成分とし、ガラス転移温度が−50℃の東洋インキ製造(株)製のアクリル系溶剤型粘着剤OPH−25(固形分40重量%)100質量部に日本ポリウレタン(株)製多官能性芳香族イソシアネート架橋剤コロネートLを3.5質量部添加してゲル分率65質量%となるように架橋度を調整したもの、剥離シートとして、スキン層/発泡層/スキン層/印刷易接着受理層をもつ東洋紡績(株)製のクリスパーK5312 100μmの易接着受理層と反対面にシリコーン系剥離剤を塗布したものを準備した。
この剥離シート上に、前記調整をした粘着剤を乾燥重量15g/mとなるように塗布乾燥し、Printpixペーパーの感熱記録面と反対側に貼り合わせて、Printpixペーパーに転写させることで、直接感熱画像記録用粘着シートを作製し評価を行った。
その結果、印画画像の色ズレは小さく、糊はみ出しが無く、接着性の良好な結果を得た。
Example 1
Printpix paper, which is a direct thermal image recording sheet manufactured by Fuji Photo Film Co., Ltd., was used as the surface base material, and the adhesive layer had a loss tangent tanδ (5) value of 0.76, 40 at 5 ° C. The value of the loss tangent tan δ (40) at 0.6 ° C. is 0.62, and the ratio of the loss tangent tan δ (5) at 5 ° C. to the loss tangent tan δ (40) at 40 ° C. T = tan δ (5) / tan δ (40) 100 parts by mass of an acrylic solvent-based pressure-sensitive adhesive OPH-25 (solid content 40% by weight) manufactured by Toyo Ink Mfg. Co., Ltd., whose main component is 2-ethylhexyl acrylate having a glass transition temperature of −50 ° C. The polyurethane layer was added with 3.5 parts by weight of a polyfunctional aromatic isocyanate cross-linking agent Coronate L, and the degree of cross-linking was adjusted so that the gel fraction was 65% by weight. Foamed layer / skin layer / printing It was prepared which was coated with a silicone release agent on the surface opposite to the easy adhesion-receiving layer Crisper K5312 100 [mu] m manufactured by TOYOBO the Corporation with an adhesive-receiving layer.
On this release sheet, the pressure-sensitive adhesive adjusted as described above is applied and dried so that the dry weight is 15 g / m 2, and is pasted on the opposite side of the thermal recording surface of the Printpix paper, and transferred to the Printpix paper directly. A pressure-sensitive adhesive sheet for thermal image recording was prepared and evaluated.
As a result, the color misregistration of the printed image was small, no paste was protruded, and a good adhesive property was obtained.

(実施例2)
粘着剤として、粘着剤層の5℃における損失正接tanδ(5)の値が0.71であり、40℃における損失正接tanδ(40)の値が0.50であり、5℃の損失正接tanδ(5)と40℃の損失正接tanδ(40)との比T=tanδ(5)/tanδ(40)が1.4であるブチルアクリレートを主成分とし、ガラス転移温度が−35℃の東洋インキ製造(株)製のアクリル系溶剤型粘着剤OPE−11(固形分39.5質量%)100質量部に日本ポリウレタン(株)製の多官能性芳香族イソシアネート架橋剤コロネートLを3質量部添加し、ゲル分率62質量%となるように架橋度を調整したものを使った以外は、実施例1と同様に直接感熱画像記録用粘着シートを作製し評価を行った。
その結果、印画画像の色ズレは小さく、糊はみ出しが無く、接着性の良好な結果を得た。
(Example 2)
As the pressure-sensitive adhesive, the value of the loss tangent tan δ (5) at 5 ° C. of the pressure-sensitive adhesive layer is 0.71, the value of the loss tangent tan δ (40) at 40 ° C. is 0.50, and the loss tangent tan δ at 5 ° C. The ratio of (5) to loss tangent tan δ (40) at 40 ° C. T = tan δ (5) / tan δ (40) is the main component butyl acrylate, and Toyo Ink with a glass transition temperature of −35 ° C. 3 parts by weight of polyfunctional aromatic isocyanate cross-linking agent Coronate L made by Nippon Polyurethane Co., Ltd. is added to 100 parts by weight of acrylic solvent-type pressure-sensitive adhesive OPE-11 (solid content: 39.5% by weight) manufactured by Manufacture Co., Ltd. Then, a pressure-sensitive adhesive sheet for thermal image recording was directly produced and evaluated in the same manner as in Example 1 except that the one having a degree of crosslinking adjusted so that the gel fraction was 62% by mass was used.
As a result, the color misregistration of the printed image was small, no paste was protruded, and a good adhesive property was obtained.

(実施例3)
粘着剤として、粘着剤層の5℃における損失正接tanδ(5)の値が0.55であり、40℃における損失正接tanδ(40)の値が0.50であり、5℃の損失正接tanδ(5)と40℃の損失正接tanδ(40)との比T=tanδ(5)/tanδ(40)が1.1である2エチルヘキシルアクリレートを主成分とし、ガラス転移温度が−55℃の東洋インキ製造(株)製のアクリル系溶剤型粘着剤OFM−11(固形分37重量%)100質量部に日本ポリウレタン(株)製の多官能性芳香族イソシアネート架橋剤コロネートLを1.5質量部添加し、ゲル分率61質量%となるように架橋度を調整したものを使い、粘着剤の塗布量を10g/mとした以外は、実施例1と同様に直接感熱画像記録用粘着シートを作製し評価を行った。その結果、印画画像の色ズレは小さく、糊はみ出しが無く、接着性の良好な結果を得た。
Example 3
As the pressure-sensitive adhesive, the loss tangent tan δ (5) at 5 ° C. of the pressure-sensitive adhesive layer is 0.55, the value of the loss tangent tan δ (40) at 40 ° C. is 0.50, and the loss tangent tan δ at 5 ° C. The ratio of (5) to loss tangent tan δ (40) at 40 ° C. T = tan δ (5) / tan δ (40) is the main component of 2-ethylhexyl acrylate having a glass transition temperature of −55 ° C. 1.5 parts by mass of polyfunctional aromatic isocyanate cross-linking agent Coronate L made by Nippon Polyurethane Co., Ltd. on 100 parts by mass of acrylic solvent-type pressure-sensitive adhesive OFM-11 (solid content: 37% by weight) manufactured by Ink Manufacturing Co., Ltd. The pressure-sensitive adhesive sheet for direct thermal image recording was added in the same manner as in Example 1 except that the amount of crosslinking was adjusted so that the gel fraction was 61% by mass and the coating amount of the pressure-sensitive adhesive was 10 g / m 2. Were prepared and evaluated. As a result, the color misregistration of the printed image was small, no paste was protruded, and a good adhesive property was obtained.

(実施例4)
実施例1で用いたアクリル系粘着剤OPH−25を使用し、多官能性芳香族イソシアネート架橋剤コロネートLを2.5質量部配合し、ゲル分率63質量%となるように架橋度を調整したものを用い、剥離シートとしてスキン層の無い発泡層のみの発泡ポリエステルフィルム 東洋紡績(株)製のクリスパーG5312 100μmの易接着受理層と反対面にシリコーン系剥離剤を塗布したものを用いた以外は、実施例1と同様に直接感熱画像記録用粘着シートを作製し評価を行った。その結果、印画画像の色ズレは小さく、糊はみ出しが無く、接着性の良好な結果を得た。
Example 4
Using the acrylic pressure-sensitive adhesive OPH-25 used in Example 1, 2.5 parts by mass of the polyfunctional aromatic isocyanate crosslinking agent Coronate L was added, and the degree of crosslinking was adjusted so that the gel fraction was 63% by mass. A foamed polyester film having only a foamed layer without a skin layer as a release sheet, except for a material having a silicone release agent coated on the opposite side of a 100 μm easy-adhesion receiving layer of Chrisper G5312 manufactured by Toyobo Co., Ltd. In the same manner as in Example 1, a thermal image-recording pressure-sensitive adhesive sheet was directly produced and evaluated. As a result, the color misregistration of the printed image was small, no paste was protruded, and a good adhesive property was obtained.

(比較例1)
粘着剤として、粘着剤層の5℃における損失正接tanδ(5)の値が1.22であり、40℃における損失正接tanδ(40)の値が0.78であり、5℃の損失正接tanδ(5)と40℃の損失正接tanδ(40)との比T=tanδ(5)/tanδ(40)が1.6である2−エチルヘキシルアクリレートを主成分とし、ガラス転移温度が−50℃の東洋インキ製造(株)製のアクリル系溶剤型粘着剤OSJ−22(固形分46質量%)100質量部に、日本ポリウレタン(株)製の多官能性芳香族イソシアネート架橋剤コロネートLを2.5質量部を添加し、ゲル分率51質量%となるように架橋度を調整したものを用いた以外は、実施例1と同様に直接感熱画像記録用粘着シートを作製し評価を行った。その結果、プリンターNC−370D、NC−471Dで印画した画像ともに色ズレが大きく、鮮明な画像が得られなかった
(Comparative Example 1)
As the pressure-sensitive adhesive, the loss tangent tan δ (5) at 5 ° C. of the pressure-sensitive adhesive layer is 1.22, the loss tangent tan δ (40) at 40 ° C. is 0.78, and the loss tangent tan δ at 5 ° C. The ratio of (5) to the loss tangent tan δ (40) at 40 ° C. T = tan δ (5) / tan δ (40) is mainly composed of 2-ethylhexyl acrylate having a glass transition temperature of −50 ° C. To 100 parts by mass of acrylic solvent-type pressure-sensitive adhesive OSJ-22 (solid content 46% by mass) manufactured by Toyo Ink Mfg. Co., Ltd., 2.5 polyfunctional aromatic isocyanate crosslinking agent Coronate L manufactured by Nippon Polyurethane Co., Ltd. was added. A heat-sensitive image-recording pressure-sensitive adhesive sheet was directly prepared and evaluated in the same manner as in Example 1 except that a part by weight was added and the degree of crosslinking was adjusted so that the gel fraction was 51% by mass. As a result, both the images printed by the printers NC-370D and NC-471D had a large color shift and a clear image could not be obtained.

(比較例2)
粘着剤として、粘着剤層の5℃における損失正接tanδ(5)の値が0.54であり、40℃における損失正接tanδ(40)の値が0.26であり、5℃の損失正接tanδ(5)と40℃の損失正接tanδ(40)との比T=tanδ(5)/tanδ(40)が2.1である2−エチルヘキシルアクリレートを主成分とし、ガラス転移温度が−30℃の日本カーバイド(株)製のアクリル系溶剤型の粘着剤OPS−7(固形分40質量%)100質量部に、日本カーバイド(株)製のエポキシ系架橋剤CK−202を1質量部配合し、ゲル分率48質量%となるように架橋度を調整したものを用いた以外は、実施例1と同様に直接感熱画像記録用粘着シートを作製し評価を行った。その結果、プリンターNC−370Dで印画した画像の色ズレが大きく、鮮明な画像が得られなかった。
(Comparative Example 2)
As the pressure-sensitive adhesive, the loss tangent tan δ (5) at 5 ° C. of the pressure-sensitive adhesive layer is 0.54, the loss tangent tan δ (40) at 40 ° C. is 0.26, and the loss tangent tan δ at 5 ° C. The ratio of (5) to the loss tangent tan δ (40) at 40 ° C. T = tan δ (5) / tan δ (40) is mainly composed of 2-ethylhexyl acrylate having a glass transition temperature of −30 ° C. Nippon Carbide Co., Ltd. acrylic solvent type adhesive OPS-7 (solid content 40% by mass) 100 parts by mass, Nippon Carbide Co., Ltd. epoxy-based cross-linking agent CK-202 is blended, A heat-sensitive image-recording pressure-sensitive adhesive sheet was directly prepared and evaluated in the same manner as in Example 1 except that the one having a degree of crosslinking adjusted to a gel fraction of 48% by mass was used. As a result, the color deviation of the image printed by the printer NC-370D was large, and a clear image could not be obtained.

(比較例3)
実施例1で用いたアクリル系粘着剤OPH−25を使用し、多官能性芳香族イソシアネート架橋剤コロネートLを1.5質量部配合し、ゲル分率57質量%となるように架橋度を調整したものを用いた以外は、実施例1と同様に直接感熱画像記録用粘着シートを作製し評価を行った。その結果、比較例2同様に、プリンターNC−370Dで印画した画像の色ズレが大きく、鮮明な画像が得られなかったばかりか、糊のはみ出し性も悪かった。
(Comparative Example 3)
Using acrylic pressure-sensitive adhesive OPH-25 used in Example 1, 1.5 parts by mass of polyfunctional aromatic isocyanate cross-linking agent Coronate L is added, and the degree of cross-linking is adjusted so that the gel fraction is 57% by mass. A direct thermal image-recording pressure-sensitive adhesive sheet was prepared and evaluated in the same manner as in Example 1 except that the prepared ones were used. As a result, as in Comparative Example 2, the color deviation of the image printed by the printer NC-370D was large, and a clear image was not obtained, and the adhesiveness of the glue was poor.

(比較例4)
実施例1で用いたアクリル系粘着剤OPH−25を使用し、多官能性芳香族イソシアネート架橋剤コロネートLを4質量部配合し、ゲル分率68質量%となるように架橋度を調整したものを用いた以外は、実施例1と同様に直接感熱画像記録用粘着シートを作製し評価を行った。その結果、比較例3とは逆に、プリンターNC−471Dで印画した画像の色ズレが大きく、鮮明な画像が得られなかったばかりか、接着性が悪くなった。
(Comparative Example 4)
Using the acrylic pressure-sensitive adhesive OPH-25 used in Example 1, 4 parts by weight of the polyfunctional aromatic isocyanate crosslinking agent Coronate L, and adjusting the degree of crosslinking so that the gel fraction is 68% by mass A direct thermal image recording pressure-sensitive adhesive sheet was prepared and evaluated in the same manner as in Example 1 except that was used. As a result, contrary to Comparative Example 3, the color deviation of the image printed by the printer NC-471D was large, and not only a clear image was obtained, but also the adhesiveness deteriorated.

(比較例5)
実施例2で用いたアクリル系粘着剤OPE−11を使用し、多官能性芳香族イソシアネート架橋剤コロネートLを4質量部配合し、ゲル分率69質量%となるように架橋度を調整したものを用いた以外は、実施例2と同様に直接感熱画像記録用粘着シートを作製し評価を行った。その結果、比較例4と同様に、プリンターNC−471Dで印画した画像の色ズレが大きく、鮮明な画像が得られなかったばかりか、接着性が悪くなった。
(Comparative Example 5)
Using acrylic pressure-sensitive adhesive OPE-11 used in Example 2, 4 parts by mass of polyfunctional aromatic isocyanate crosslinking agent Coronate L, and adjusting the degree of crosslinking so that the gel fraction is 69% by mass A direct thermal image recording pressure-sensitive adhesive sheet was prepared and evaluated in the same manner as in Example 2 except that was used. As a result, as in Comparative Example 4, the color deviation of the image printed by the printer NC-471D was large and not only a clear image was obtained, but also the adhesiveness deteriorated.

(品質評価)
上記で得られた粘着シートを下記の評価方法で評価した。その結果を表1に示す。
(quality evaluation)
The pressure-sensitive adhesive sheet obtained above was evaluated by the following evaluation method. The results are shown in Table 1.

[tanδの測定方法]
動的粘弾性測定装置を用いて約2mm厚の板状に成膜した粘着剤を周波数1Hzで剪断変形させたときに得られる動的複素弾性率の内、応力と同位相の貯蔵弾性率G’と90゜位相の遅れた損失弾性率G’’より、損失正接tanδ=G’’/G’として求められる。尚、損失正接tanδが0であれば完全弾性体、∞であれば完全粘性体となる。
[印画画像の色ズレ]
作製した直接感熱画像記録用粘着シートを、富士写真フイルム(株)製Printpixプリンター NC−370DおよびNC−471Dを用い、5℃、20%RH、23℃50%RH、35℃、80%RHの環境下でテストパターン「2−10」を10枚連続印画し、マゼンタ(M)に対するイエロー(Y)とシアン(C)の色ズレを測定した。
(評価基準)
○:全ての環境において、色ズレが±150μm以下の場合。
△:±150μmを超え、±170μm以下。
×:±170μm超えた場合。
[Measurement method of tan δ]
The storage elastic modulus G in the same phase as the stress among the dynamic complex elastic modulus obtained when the adhesive formed into a plate shape with a thickness of about 2 mm using a dynamic viscoelasticity measuring device is subjected to shear deformation at a frequency of 1 Hz. The loss tangent tan δ = G ″ / G ′ is obtained from the loss elastic modulus G ″ with a phase difference of 90 °. If the loss tangent tan δ is 0, it is a complete elastic body, and if it is ∞, it is a complete viscous body.
[Color shift of printed image]
The produced direct thermal image recording adhesive sheet was printed at 5 ° C., 20% RH, 23 ° C. 50% RH, 35 ° C., 80% RH using Printpix printers NC-370D and NC-471D manufactured by Fuji Photo Film Co., Ltd. Ten test patterns “2-10” were continuously printed under the environment, and the color misalignment between yellow (Y) and cyan (C) with respect to magenta (M) was measured.
(Evaluation criteria)
○: When the color misregistration is ± 150 μm or less in all environments.
Δ: Over ± 150 μm and within ± 170 μm.
X: When exceeding ± 170 μm.

[糊はみ出し]
作製した直接感熱画像記録用粘着シートを10枚重ね、学振式試験機にポリエステルフィルム50μmに端部が当たるようにセットし、1.5Kg荷重で100往復擦り、ポリエステルフィルムに付着した粘着剤の量を目視で判定する。
(評価基準)
○:目視でほとんどわかないレベル。
△:付着の少ないもの。
×:付着の多い物。
[Glue protruding]
10 sheets of the prepared direct thermal image recording pressure-sensitive adhesive sheets were stacked, set on a Gakushin tester so that the ends of the polyester film were 50 μm, rubbed 100 times with a load of 1.5 kg, and the pressure-sensitive adhesive adhered to the polyester film The amount is judged visually.
(Evaluation criteria)
○: Level that is hardly noticed visually.
(Triangle | delta): A thing with little adhesion.
X: A thing with much adhesion.

[接着性]
16mm×23mmの大きさに打ち抜いた直接感熱画像記録用粘着シートを微塗工紙(商品名:ニューエージ81.4g/m)、コート紙(商品名:OK金藤片面84.9g/m)、キャストコート紙(商品名:Nミラー84.9g/m)に貼り、40℃、1日後の四隅の浮きを測定した。
(評価基準)
○:最大浮き上がり量が、0.1mm以下。
△:最大浮き上がり量が、0.1mmを超え、1mm未満。
×:最大浮き上がり量が、1mm以上。
[Adhesiveness]
16 mm × 23 mm directly punched to a size thermal image recording adhesive sheet Binurikoshi (trade name: New Age 81.4g / m 2), coated paper (trade name: OK KINFUJI sided 84.9 g / m 2 ), Cast-coated paper (trade name: N mirror 84.9 g / m 2 ), and measured the floating of the four corners after 1 day at 40 ° C.
(Evaluation criteria)
○: The maximum lifting amount is 0.1 mm or less.
Δ: The maximum lifting amount exceeds 0.1 mm and is less than 1 mm.
X: The maximum lifting amount is 1 mm or more.

Figure 2006007438
Figure 2006007438

表中の剥離シート基材 Kは、クリスパーK5312 100μm
Gは、クリスパーG5312 100μm
Release sheet substrate K in the table is Krisper K5312 100 μm
G is Crisper G5312 100 μm

本発明は、デジタルカメラ,スキャナー,コンピューターによる画像等をフルカラー画像として出力する直接感熱画像記録方式に使用する粘着シートの各色画像の色ズレが少なくなるので、鮮明な画像の粘着シートに適用できる。
The present invention can be applied to a pressure-sensitive adhesive sheet having a clear image because the color shift of each color image of the pressure-sensitive adhesive sheet used in the direct thermal image recording method for outputting a digital camera, scanner, computer image or the like as a full color image is reduced.

Claims (2)

画像記録層と支持体からなる直接感熱画像記録用シートの該記録層の反対面に粘着剤層を設けたシートと、発泡ポリエステルフィルムの片面に剥離剤層、もう一方の面に印刷易接着受理層を設けた剥離シートであって、該剥離剤層が粘着剤層と対峙するように順次積層させた直接感熱画像記録用粘着シートにおいて、粘着剤層の5℃における損失正接tanδ(5)と40℃における損失正接tanδ(40)の値が0.4〜0.8の間にあり、かつ前記粘着剤のゲル分率が60〜66質量%であることを特徴とする画像記録用粘着シート。 Direct thermal image recording sheet comprising an image recording layer and a support, a sheet provided with an adhesive layer on the opposite surface of the recording layer, a release agent layer on one side of the foamed polyester film, and an easy-to-print adhesive reception on the other side In the pressure sensitive adhesive sheet for direct thermal image recording, wherein the release agent layer is sequentially laminated so that the release agent layer faces the pressure sensitive adhesive layer, the loss tangent tanδ (5) of the pressure sensitive adhesive layer at 5 ° C. The pressure-sensitive adhesive sheet for image recording, wherein the loss tangent tan δ (40) value at 40 ° C. is between 0.4 and 0.8, and the gel fraction of the pressure-sensitive adhesive is 60 to 66% by mass. . 前記粘着剤層の5℃の損失正接tanδ(5)と40℃の損失正接tanδ(40)との比T=tanδ(5)/tanδ(40)が、1.5以下である請求項1記載の画像記録用粘着シート。
The ratio T = tan δ (5) / tan δ (40) of the loss tangent tan δ (5) at 5 ° C. and the loss tangent tan δ (40) at 40 ° C. of the pressure-sensitive adhesive layer is 1.5 or less. Adhesive sheet for image recording.
JP2004183900A 2004-06-22 2004-06-22 Self-adhesive sheet for image recording Pending JP2006007438A (en)

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JP2019173003A (en) * 2018-03-27 2019-10-10 Dic株式会社 Manufacturing method of laminate containing adhesive sheet
JP2019173001A (en) * 2018-03-27 2019-10-10 Dic株式会社 Curable adhesive composition, adhesive sheet using the same, laminate containing the adhesive sheet, and manufacturing method therefor
JP2019173002A (en) * 2018-03-27 2019-10-10 Dic株式会社 Curable adhesive composition, adhesive sheet using the same, laminate containing the same, and manufacturing method therefor

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JP2019173003A (en) * 2018-03-27 2019-10-10 Dic株式会社 Manufacturing method of laminate containing adhesive sheet
JP2019173001A (en) * 2018-03-27 2019-10-10 Dic株式会社 Curable adhesive composition, adhesive sheet using the same, laminate containing the adhesive sheet, and manufacturing method therefor
JP2019173002A (en) * 2018-03-27 2019-10-10 Dic株式会社 Curable adhesive composition, adhesive sheet using the same, laminate containing the same, and manufacturing method therefor
JP7306015B2 (en) 2018-03-27 2023-07-11 Dic株式会社 Curable adhesive composition, adhesive sheet using the same, laminate containing the same, and method for producing the same
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