JP4918444B2 - Thermal transfer medium - Google Patents
Thermal transfer medium Download PDFInfo
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- JP4918444B2 JP4918444B2 JP2007243137A JP2007243137A JP4918444B2 JP 4918444 B2 JP4918444 B2 JP 4918444B2 JP 2007243137 A JP2007243137 A JP 2007243137A JP 2007243137 A JP2007243137 A JP 2007243137A JP 4918444 B2 JP4918444 B2 JP 4918444B2
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- 238000012546 transfer Methods 0.000 title claims description 40
- 239000010410 layer Substances 0.000 claims description 71
- 239000004925 Acrylic resin Substances 0.000 claims description 24
- 229920000178 Acrylic resin Polymers 0.000 claims description 24
- 229920001187 thermosetting polymer Polymers 0.000 claims description 21
- 229920001228 polyisocyanate Polymers 0.000 claims description 20
- 239000005056 polyisocyanate Substances 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000012790 adhesive layer Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 description 14
- 239000002932 luster Substances 0.000 description 13
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 12
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 7
- -1 for example Substances 0.000 description 7
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000010408 film Substances 0.000 description 5
- 239000011241 protective layer Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
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- 239000010931 gold Substances 0.000 description 3
- 229920006267 polyester film Polymers 0.000 description 3
- 239000004831 Hot glue Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000007756 gravure coating Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000005022 packaging material Substances 0.000 description 2
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- 229920001155 polypropylene Polymers 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
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- 239000007787 solid Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000001771 vacuum deposition Methods 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 229910002012 Aerosil® Inorganic materials 0.000 description 1
- 229910002016 Aerosil® 200 Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000004203 carnauba wax Substances 0.000 description 1
- 235000013869 carnauba wax Nutrition 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
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- 238000005336 cracking Methods 0.000 description 1
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- 229910010272 inorganic material Inorganic materials 0.000 description 1
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- 238000007733 ion plating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 239000012170 montan wax Substances 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 239000012508 resin bead Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Landscapes
- Decoration By Transfer Pictures (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
Description
本発明は、熱転写媒体に関し、詳しくは高輝度の金属光沢を有する文字や画像を印字するための熱転写媒体に関する。 The present invention relates to a thermal transfer medium, and more particularly to a thermal transfer medium for printing characters and images having a high-brightness metallic luster.
従来、サーマルヘッド等を用いて印字して金属光沢を有する文字や画像を得るための感熱転写媒体としては、ベースフィルムの片面に、熱溶融性のワックス若しくは樹脂にアルミニウム等の金属粉末を分散させた転写層を設けたものがあった。しかし、このような感熱転写媒体で印字を行うと、転写層に金属粉末を使用しているので印字された表面は滑らかにならず光を乱反射するため、いわゆる擬似金属光沢しか得られなかった。 Conventionally, as a thermal transfer medium for obtaining characters and images having a metallic luster by printing with a thermal head or the like, a metal powder such as aluminum is dispersed in a heat-melting wax or resin on one side of a base film. Some transfer layers were provided. However, when printing is performed with such a thermal transfer medium, since the metal powder is used for the transfer layer, the printed surface is not smooth and diffusely reflects light, so that only a so-called pseudo-metallic luster is obtained.
そこで、この改良を目的として、基材の一方の面に、転写層として、熱溶融性の剥離層、蒸着アンカー層、金属蒸着層及び熱溶融性の接着層が順次設けられていることを特徴とする金属光沢熱転写記録媒体が提案されている（例えば特許文献１）。しかし、このような構成であると、通常、印字される転写層は耐熱性が悪く、１３０℃〜１４０℃／ドットと一般的に言われているサーマルヘッドの温度で、転写層に熱ひずみが生じるため金属光沢が低下し、高輝度の金属光沢は得られていない。 Therefore, for this improvement, a heat-melting release layer, a deposition anchor layer, a metal deposition layer, and a heat-melting adhesive layer are sequentially provided as a transfer layer on one surface of the substrate. A metallic gloss thermal transfer recording medium is proposed (for example, Patent Document 1). However, with such a configuration, the transfer layer to be printed usually has poor heat resistance, and the thermal distortion of the transfer layer occurs at the temperature of a thermal head generally referred to as 130 ° C. to 140 ° C./dot. As a result, the metallic luster is lowered, and a high luminance metallic luster is not obtained.
このような問題を解決するため、基材の一方の面に離型層、アンカー層、金属層、ホットメルト型接着剤層を順次設けた熱転写媒体において、アンカー層の樹脂に熱硬化性樹脂を５０〜９５重量％含み残部が熱可塑性樹脂からなる樹脂を使用した熱転写媒体が提案されている（例えば特許文献２）。 In order to solve such problems, in a thermal transfer medium in which a release layer, an anchor layer, a metal layer, and a hot-melt adhesive layer are sequentially provided on one surface of a base material, a thermosetting resin is used as the anchor layer resin. There has been proposed a thermal transfer medium using a resin containing 50 to 95% by weight and the balance being a thermoplastic resin (for example, Patent Document 2).
しかし、上記のような方法では、熱硬化性樹脂として二液硬化型のアクリル樹脂を使用し、残部が熱可塑性樹脂からなる樹脂を使用することから、以下のような問題がある。 However, the method as described above has the following problems because a two-component curable acrylic resin is used as the thermosetting resin, and the remainder is made of a thermoplastic resin.
（１）二液硬化型のアクリル樹脂を所定量配合した場合、耐熱性が高くなり過ぎ、印字の際サーマルヘッドからの熱が過度に必要となるため、高速で印字した場合印字が欠けることとなり速度を上げることができない。 (1) When a predetermined amount of two-component curable acrylic resin is blended, the heat resistance becomes too high, and excessive heat from the thermal head is required for printing. The speed cannot be increased.
（２）印字速度を上げるために熱可塑性樹脂の配合量を増加させたとしても、熱可塑性樹脂部分の耐熱性が低すぎ、速度を上げて印字した場合、印字の欠けは防ぐことができるが尾引き（印字流れ）やつぶれの原因となる。
本発明は、上記問題点に鑑みてなされたものであって、印字速度の向上を図ることができ、かつ所望の耐熱性や擦過性を保持している熱転写媒体を提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a thermal transfer medium capable of improving the printing speed and maintaining desired heat resistance and scratch resistance. .
上記の目的を達成すべく、本発明は、基材上に、少なくとも剥離層、アンカー層、金属層及び接着層がこの順で設けられている熱転写媒体であって、前記アンカー層が、ポリイソシアネートと一液性熱硬化型アクリル樹脂とを５０：５０〜８０：２０の配合割合（質量比）で含有すること、を特徴とする熱転写媒体を提供する。 In order to achieve the above object, the present invention provides a thermal transfer medium in which at least a release layer, an anchor layer, a metal layer, and an adhesive layer are provided in this order on a substrate, and the anchor layer is a polyisocyanate. And a one-component thermosetting acrylic resin in a mixing ratio (mass ratio) of 50:50 to 80:20.
本発明によれば、アンカー層を、所定の割合でポリイソシアネートと一液性熱硬化型アクリル樹脂とを含有するインク組成物から形成することにより、耐熱性を有し、高速印字を行っても印字欠け、印字流れ及び印字つぶれが発生しない熱転写媒体を提供することができる。 According to the present invention, the anchor layer is formed from an ink composition containing polyisocyanate and a one-component thermosetting acrylic resin at a predetermined ratio, so that it has heat resistance and can perform high-speed printing. It is possible to provide a thermal transfer medium that does not cause printing defects, printing flow, and printing crushing.
以下、本発明の熱転写媒体をより詳細に説明する。本発明者は、耐熱性を有し、高速印字を行っても印字欠け、印字流れ及び印字つぶれが発生しない熱転写媒体を開発するため、熱転写媒体の層構成について検討するとともに、アンカー層を構成するインク組成物の材料について検討を重ねてきた。その結果、ポリイソシアネートと一液性熱硬化型アクリル樹脂とを一定の割合で含有するインク組成物を用いてアンカー層を形成すると、所望の効果が達成できることを見出し、本発明を完成するに至った。 Hereinafter, the thermal transfer medium of the present invention will be described in more detail. The present inventor examines the layer structure of the thermal transfer medium and forms an anchor layer in order to develop a thermal transfer medium that has heat resistance and does not generate print defects, print flow, and print collapse even when high-speed printing is performed. The material of the ink composition has been studied repeatedly. As a result, it was found that a desired effect can be achieved by forming an anchor layer using an ink composition containing polyisocyanate and a one-component thermosetting acrylic resin at a certain ratio, and the present invention has been completed. It was.
本発明の熱転写媒体に使用する基材は従来の熱転写媒体用として用いられている基材であればよく、具体的にはポリエステルフィルム等が挙げられる。基材の厚さは２．５μｍ〜９μｍ程度のものが好ましい。基材の厚さが２．５μｍ以上であれば製造時にしわやフィルム切れなどが起こりにくく、９μｍ以下であれば印字の際の熱の伝わりを確保でき良好な印字精度が得られる。 The base material used for the thermal transfer medium of the present invention may be any base material used for conventional thermal transfer media, and specific examples include polyester films. The thickness of the substrate is preferably about 2.5 μm to 9 μm. If the thickness of the substrate is 2.5 μm or more, wrinkles and film breakage are unlikely to occur during production, and if it is 9 μm or less, the transfer of heat during printing can be secured and good printing accuracy can be obtained.
また、熱転写媒体用として市販されている基材としてのポリエステルフィルムには、通常、金属層を設ける側の反対面にスティッキングを防止するための耐熱保護層が設けられている。本発明においても、できればこのような耐熱保護層が設けられているフィルムを基材として利用することが好ましい。もちろん、上記した耐熱保護層が設けられていない基材を用い、別途耐熱保護層を設けてもよいことは言うまでもない。 Moreover, the polyester film as a base material marketed for thermal transfer media is usually provided with a heat-resistant protective layer for preventing sticking on the surface opposite to the side on which the metal layer is provided. Also in the present invention, if possible, it is preferable to use a film provided with such a heat-resistant protective layer as a substrate. Of course, it goes without saying that a heat-resistant protective layer may be provided separately using a base material on which the above-mentioned heat-resistant protective layer is not provided.
基材に設けられる剥離層は、アンカー層の耐熱性と金属層の鮮明な印字を保持するため、薄膜である必要がある。剥離層の厚さは０．００１〜０．５μｍが好ましい。剥離層の厚さが０．００１μｍ以上であれば、印字時に金属層が確実に剥がれる。剥離層の厚さが０．５μｍ以下であれば、印字の際に熱溶融が広範囲で起こることがなく、印字した文字や画像のドット精度を確保することができ、また、アンカー層へ熱溶融成分がしみ込みにくく、アンカー層の耐熱性の劣化が起こりにくい。剥離層はグラビアコート法により設けることができる。剥離層の厚さは、インクの固形分を調整することにより制御できる。 The release layer provided on the substrate needs to be a thin film in order to maintain the heat resistance of the anchor layer and the clear printing of the metal layer. The thickness of the release layer is preferably 0.001 to 0.5 μm. If the thickness of the release layer is 0.001 μm or more, the metal layer is reliably peeled off during printing. If the thickness of the release layer is 0.5 μm or less, thermal melting does not occur in a wide range during printing, and the dot accuracy of printed characters and images can be secured, and the anchor layer is thermally fused. The component is difficult to penetrate and the heat resistance of the anchor layer is hardly deteriorated. The release layer can be provided by a gravure coating method. The thickness of the release layer can be controlled by adjusting the solid content of the ink.
剥離層は、例えばパラフィンワックス、モンタンワックス、カルナバワックス、ポリエチレンワックス及びアマイドワックス等のワックス類、並びにシリコーン樹脂及びアクリル樹脂等の樹脂剥離剤等を、それぞれ単独で又は任意に混合して使用することができる。 For the release layer, for example, waxes such as paraffin wax, montan wax, carnauba wax, polyethylene wax and amide wax, and resin release agents such as silicone resin and acrylic resin are used alone or in any desired mixture. Can do.
剥離層上に設けるアンカー層は、印字を行うサーマルヘッドの温度に耐えるだけの耐熱性を必要とし、熱で歪まず、金属層の平面性を保持する役割を持つものである。また、アンカー層が必要以上の耐熱性を保持すると、金属層や接着層への熱伝達を阻害して印字品位の低下を招くため、アンカー層はかかる印字品位の低下を招かない程度の熱伝達性を有することが必要である。そのため、本発明におけるアンカー層にはポリイソシアネート及び一液性熱硬化型アクリル樹脂とを含有させる必要がある。 The anchor layer provided on the release layer needs to have heat resistance enough to withstand the temperature of the thermal head that performs printing, and has the role of maintaining the flatness of the metal layer without being distorted by heat. In addition, if the anchor layer retains heat resistance more than necessary, heat transfer to the metal layer or adhesive layer is hindered, resulting in deterioration of print quality. Therefore, the anchor layer does not cause such deterioration of print quality. It is necessary to have sex. Therefore, the anchor layer in the present invention needs to contain polyisocyanate and a one-component thermosetting acrylic resin.
このように、アンカー層がポリイソシアネート及び一液性熱硬化型アクリル樹脂を含有すれば、前記ポリイソシアネートによって所望の耐熱性を確保することができ、前記ポリイソシアネートに対して所定量の一液性熱硬化型アクリル樹脂を配合することによって耐熱性の低下を最小限に抑えつつ高速印字時の熱応答性を向上させることができる。 Thus, if the anchor layer contains polyisocyanate and a one-component thermosetting acrylic resin, desired heat resistance can be secured by the polyisocyanate, and a predetermined amount of one-component with respect to the polyisocyanate. By blending the thermosetting acrylic resin, it is possible to improve the thermal responsiveness during high-speed printing while minimizing a decrease in heat resistance.
ここで、ポリイソシアネートとしては、特に限定はなく、本発明の分野及びその他の分野で用いられているポリイソシアネートであればよい。このようなポリイソシアネートとしては、例えば、大日精化工業（株）製のクロスネート（商品名）及び大日本インキ化学工業（株）製のバーノック（商品名）等の市販品を挙げることができる。 Here, the polyisocyanate is not particularly limited and may be any polyisocyanate used in the field of the present invention and other fields. Examples of such polyisocyanates include commercially available products such as Crossnate (trade name) manufactured by Dainichi Seika Kogyo Co., Ltd. and Barnock (trade name) manufactured by Dainippon Ink & Chemicals, Inc. .
また、一液性熱硬化型アクリル樹脂としては、特に限定はなく、通常の一液性熱硬化型アクリル樹脂を用いることができる。このような一液性熱硬化型アクリル樹脂としては、例えば、（株）岐阜セラツク製造所製のＵＮＯ−１（商品名）及び綜研化学（株）製の一液硬化型サーモラック（商品名）等の市販品を挙げることができる。 The one-component thermosetting acrylic resin is not particularly limited, and a normal one-component thermosetting acrylic resin can be used. As such one-component thermosetting acrylic resin, for example, UNO-1 (trade name) manufactured by Gifu Serask Manufacturing Co., Ltd. and one-component curable thermolac (trade name) manufactured by Soken Chemical Co., Ltd. And other commercial products.
本発明におけるポリイソシアネートと一液性熱硬化型アクリル樹脂との配合割合（質量比）は５０：５０〜８０：２０であることが好ましい。すなわち、一液性熱硬化型アクリル樹脂とポリイソシアネートとの配合割合が略同一か、上記範囲で一液性熱硬化型アクリル樹脂に比べてポリイソシアネートの配合割合が多い。一液性熱硬化型アクリル樹脂がポリイソシアネートの１／２以下であれば、耐熱性を確保することができ、印字品位の低下を招きにくい。また、一液性熱硬化型アクリル樹脂がポリイソシアネートの１／４以上であれば、高速印字時の熱応答性が低下しにくい。 The blending ratio (mass ratio) of the polyisocyanate and the one-component thermosetting acrylic resin in the present invention is preferably 50:50 to 80:20. That is, the blending ratio of the one-part thermosetting acrylic resin and the polyisocyanate is substantially the same, or the blending ratio of the polyisocyanate is larger than the one-part thermosetting acrylic resin in the above range. If the one-component thermosetting acrylic resin is 1/2 or less of the polyisocyanate, the heat resistance can be ensured, and the print quality is hardly deteriorated. Moreover, if the one-component thermosetting acrylic resin is 1/4 or more of polyisocyanate, the thermal responsiveness during high-speed printing is unlikely to decrease.
アンカー層の厚さは、０．５μｍ〜１．５μｍの範囲が好ましい。０．５μｍ以上であれば、耐熱不良が生じるおそれがなく、１．５μｍ以下であれば、割れの問題が発生しにくい。なお、アンカー層には、耐熱性に悪影響を与えない範囲で、必要に応じて染料又は顔料等を混入して、ゴールド、レッド又はブルー等、好みの色に着色してもよい。アンカー層は、例えばグラビアコート法等により設けることができる。 The thickness of the anchor layer is preferably in the range of 0.5 μm to 1.5 μm. If it is 0.5 μm or more, there is no fear of heat resistance failure, and if it is 1.5 μm or less, the problem of cracking is unlikely to occur. The anchor layer may be mixed with a desired color such as gold, red, or blue by mixing a dye or a pigment, if necessary, within a range that does not adversely affect the heat resistance. The anchor layer can be provided by, for example, a gravure coating method.
アンカー層上には金属層を設ける。金属としては、例えばＡｌ（アルミニウム）、Ｓｎ（スズ）、Ｃｒ（クロム）、Ｃｕ（銅）又はＡｕ（金）等が挙げられる。かかる金属層は、例えば真空蒸着、イオンプレーティング又はスパッタリング等の常法に従って、１００〜８００Å程度の厚さで設ける。 A metal layer is provided on the anchor layer. Examples of the metal include Al (aluminum), Sn (tin), Cr (chromium), Cu (copper), and Au (gold). Such a metal layer is provided with a thickness of about 100 to 800 mm according to a conventional method such as vacuum deposition, ion plating, or sputtering.
金属層上には、例えばアクリル系樹脂、ビニル系樹脂、ウレタン系樹脂又はワックス類等をそれぞれ単独で又は任意に混合して、印字される被受像体の種類に応じて、接着層を設ける。被受像体の表面状態や材質にもよるが、接着層が薄すぎると、印字した文字や画像の良好な密着が得られず、接着層が厚すぎると、サーマルヘッドの熱による接着成分の移動が起こり、金属層の平面性が悪くなって金属光沢が落ちたり、印字精度が悪くなったりする。接着層は、被受像体との接着を保持できる限り、薄いほうが金属層の平面性をより確実に保つことができより高輝度の金属光沢を有する文字や画像が得られる。接着層の厚さは、被受像体の種類及び表面状態等に応じて適宜選択されるが、通常は０．１〜５μｍの範囲が好ましい。 On the metal layer, for example, an acrylic resin, a vinyl resin, a urethane resin, or a wax is singly or arbitrarily mixed, and an adhesive layer is provided in accordance with the type of the image receiving object to be printed. Depending on the surface condition and material of the image-receiving member, if the adhesive layer is too thin, good adhesion of printed characters and images cannot be obtained. If the adhesive layer is too thick, the adhesive component moves due to the heat of the thermal head. As a result, the flatness of the metal layer is deteriorated and the metallic luster is lowered or the printing accuracy is deteriorated. As long as the adhesive layer can maintain adhesion to the image receiving member, the thinner the adhesive layer, the more securely the planarity of the metal layer can be maintained, and characters and images having a higher brightness of metallic luster can be obtained. The thickness of the adhesive layer is appropriately selected according to the type and surface state of the image receiving member, but is usually in the range of 0.1 to 5 μm.
また、接着層には、熱転写媒体の巻き取り時のしわ防止、ロール状での保管時による熱転写媒体の貼り付き防止、及び接着面を荒らすことにより被受像体との密着力向上等の目的のために、微粉末のスリップ剤を添加することが望ましい。微粉末のスリップ剤としては、例えばシリカ及びタルク等の無機材料の粉末や樹脂ビーズ等の有機フィラー等が挙げられる。スリップ剤は接着層中に２〜３０質量％含ませるのが望ましい。スリップ剤の添加量が２質量％以上であれば、熱転写媒体のすべりが良く加工や保管が容易となり、３０質量％以下であれば、接着に関与する成分が少なくなり過ぎず接着力を確保することができる。接着層は、例えばリバースコート法等により設けることができる。 In addition, the adhesive layer has a purpose of preventing wrinkling when winding the thermal transfer medium, preventing sticking of the thermal transfer medium when stored in a roll shape, and improving the adhesion with the image receiving member by roughening the adhesive surface. Therefore, it is desirable to add a fine powder slip agent. Examples of the fine powder slip agent include powders of inorganic materials such as silica and talc, and organic fillers such as resin beads. The slip agent is desirably contained in the adhesive layer in an amount of 2 to 30% by mass. If the addition amount of the slip agent is 2% by mass or more, the thermal transfer medium is slippery and easy to process and store, and if it is 30% by mass or less, the components involved in the adhesion are not reduced and the adhesive force is secured. be able to. The adhesive layer can be provided by, for example, a reverse coating method.
このようにして基材上に各層を順次設けた転写層（剥離層、アンカー層、金属層及び接着層）全体の厚さは、基材の厚さ以下であることが好ましい。転写層の厚さが基材の厚さを超えると、印字時の熱伝達の程度と時間のバランスが良好に保ちにくくなって、印字精度や金属光沢の低下が起こる。 Thus, the total thickness of the transfer layer (peeling layer, anchor layer, metal layer, and adhesive layer) in which each layer is sequentially provided on the substrate is preferably equal to or less than the thickness of the substrate. If the thickness of the transfer layer exceeds the thickness of the substrate, it is difficult to maintain a good balance between the degree of heat transfer during printing and the time, and printing accuracy and metallic gloss are reduced.
次に、実施例及び比較例を挙げて本発明をさらに具体的に説明する。なお、実施例及び比較例中、「部」とあるのは、特に断りがない限り質量基準である。また、溶剤以外の成分の量は全て固形分換算である。 Next, the present invention will be described more specifically with reference to examples and comparative examples. In Examples and Comparative Examples, “part” is based on mass unless otherwise specified. Moreover, the amount of components other than the solvent is all in terms of solid content.
《実施例１》
基材である厚さ５．６μｍのポリエチレンテレフタレートフィルム（三菱化学ポリエステルフィルム（株）製）の一方の面に、下記組成（Ｉ）の塗布液を塗布量が０．３ｇ／ｍ2となるようにグラビアコーターを用いて塗布し、乾燥させて耐熱保護層を形成した。
組成（Ｉ）：
シリコーン樹脂 １０部
トルエン ４５部
メチルエチルケトン（ＭＥＫ） ４５部
Example 1
On one side of a 5.6 μm thick polyethylene terephthalate film (manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.), which is a base material, a coating liquid having the following composition (I) is applied in an amount of 0.3 g / m 2. It was applied using a gravure coater and dried to form a heat-resistant protective layer.
Composition (I):
Silicone resin 10 parts Toluene 45 parts Methyl ethyl ketone (MEK) 45 parts
上記ポリエチレンテレフタレートフィルムの他方の面に、下記組成（II）の塗布液を塗布量が０．５ｇ／ｍ2となるようにグラビアコーターを用いて塗布し、乾燥させて剥離層を形成した。
組成（II）：
ポリエチレンワックス ９部
エチレン−酢酸ビニル共重合体 １部
トルエン １０部
On the other surface of the polyethylene terephthalate film, a coating solution having the following composition (II) was applied using a gravure coater so that the coating amount was 0.5 g / m 2 and dried to form a release layer.
Composition (II):
Polyethylene wax 9 parts Ethylene-vinyl acetate copolymer 1 part Toluene 10 parts
この剥離層上に、下記組成（III）の塗布液（インク組成物）を塗布量が１．０ｇ/m2となるようにグラビアコーターを用いて塗布し、乾燥後、１３０℃×３０分の条件で硬化させてアンカー層を形成した。
組成（III）：
ポリイソシアネート ７部
（大日精化工業（株）製のクロスネートＤ−７０（商品名））
一液性熱硬化型アクリル樹脂 ３部
（（株）岐阜セラツク製造所製のＵＮＯ−１（商品名））
ＭＥＫ ３０部
On this release layer, a coating liquid (ink composition) having the following composition (III) was applied using a gravure coater so that the coating amount was 1.0 g / m 2 , dried, and then 130 ° C. × 30 minutes. An anchor layer was formed by curing under conditions.
Composition (III):
7 parts of polyisocyanate (Crosnate D-70 (trade name) manufactured by Dainichi Seika Kogyo Co., Ltd.)
Three-part one-part thermosetting acrylic resin (UNO-1 (trade name) manufactured by Gifu Seratsuk Factory)
30 parts of MEK
さらに、上記アンカー層上に、Ａｌを真空蒸着法によって蒸着し、厚さ４００Åの金属層を設けた。 Further, Al was deposited on the anchor layer by a vacuum deposition method to provide a metal layer having a thickness of 400 mm.
最後に、該金属層上に、下記組成（IV）の塗料をリバースコート法によりコーティングし、乾燥炉で熱風乾燥することにより、塗布量が約０．５ｇ/m2のホットメルト型の接着層を設け、本発明の熱転写媒体を得た。
組成（IV）：
ビニル系樹脂（米国ユニオンカーバイト社製のＶＭＣＨ（商品名）） １０部
アクリル系樹脂（米国ローム＆ハース社製のパラロイドＢ−４４（商品名））１０部
シリカ粉末（日本エアロジル（株）製のアエロジル２００（商品名）） ２部
トルエン ７８部
Finally, a coating material having the following composition (IV) is coated on the metal layer by a reverse coating method and dried with hot air in a drying furnace, whereby a hot-melt adhesive layer having an application amount of about 0.5 g / m 2. The thermal transfer medium of the present invention was obtained.
Composition (IV):
10 parts vinyl resin (VMCH (trade name) manufactured by Union Carbide, USA) 10 parts Acrylic resin (paraloid B-44 (trade name) manufactured by Rohm & Haas, USA) Silica powder (manufactured by Nippon Aerosil Co., Ltd.) Aerosil 200 (trade name)) 2 parts Toluene 78 parts
《実施例２〜４》
実施例１においてアンカー層を構成するポリイソシアネートと一液性熱硬化型アクリル樹脂との配合割合を表１に示す値とした以外は、実施例１と同様にして本発明の熱転写媒体を得た。
<< Examples 2 to 4 >>
A thermal transfer medium of the present invention was obtained in the same manner as in Example 1 except that the blending ratio of the polyisocyanate constituting the anchor layer and the one-component thermosetting acrylic resin in Example 1 was changed to the values shown in Table 1. .
《比較例１及び２》
実施例１においてアンカー層を構成するポリイソシアネートと一液性熱硬化型アクリル樹脂との配合割合を表１に示す値とした以外は、実施例１と同様にして比較用の熱転写媒体を得た。
<< Comparative Examples 1 and 2 >>
A thermal transfer medium for comparison was obtained in the same manner as in Example 1 except that the blending ratio of the polyisocyanate constituting the anchor layer and the one-component thermosetting acrylic resin in Example 1 was changed to the values shown in Table 1. .
《比較例３》
アンカー層を構成する塗料として以下の組成を有する塗料を用いた以外は、実施例１と同様にして比較用の熱転写媒体を得た。
二液性熱硬化アクリル樹脂 ６０部
（大日本インキ化学工業（株）製のアクリディックＡ−８１０（商品名））
ポリイソシアネート（硬化剤） ３部
（大日本インキ化学工業（株）製のバーノックＤ−８００（商品名）） ニトロセルロース １１部
ＭＥＫ ３６０部
<< Comparative Example 3 >>
A comparative thermal transfer medium was obtained in the same manner as in Example 1 except that a paint having the following composition was used as the paint constituting the anchor layer.
Two-part thermosetting acrylic resin 60 parts (Acridic A-810 (trade name) manufactured by Dainippon Ink & Chemicals, Inc.)
3 parts of polyisocyanate (curing agent) (Bernock D-800 (trade name) manufactured by Dainippon Ink and Chemicals, Inc.) Nitrocellulose 11 parts MEK 360 parts
［評価試験］
実施例１〜４で得られた本発明の熱転写媒体及び比較例１〜３で得られた比較用熱転写媒体に対して、ポリプロピレン包装材を５ｍ／ｍｉｎ、２５ｍ／ｍｉｎの各速度でコンベア上を移動させながら、熱転写プリンター（ＥＤＭ社製のＳｍａｒｔＤａｔｅ−３ｃ（製品名））を用いて印字を行い、ポリプロピレン包装材上に印字パターンを形成し印字サンプルを得た。得られた印字サンプルを、印字品位、擦過性及び金属光沢の観点から、次の方法で評価した。
[Evaluation test]
With respect to the thermal transfer medium of the present invention obtained in Examples 1 to 4 and the comparative thermal transfer medium obtained in Comparative Examples 1 to 3, the polypropylene packaging material was moved on the conveyor at respective speeds of 5 m / min and 25 m / min. While moving, printing was performed using a thermal transfer printer (SmartDate-3c (product name) manufactured by EDM) to form a print pattern on a polypropylene packaging material to obtain a print sample. The obtained print samples were evaluated by the following methods from the viewpoints of print quality, scratch resistance and metallic luster.
（１）印字品位
得られた印字サンプルを目視で印字欠け、印字流れ、印字つぶれの有無を確認することで評価した。評価基準を以下のとおりとした。評価結果を表２に示す。
○：印字欠け、印字流れ、印字つぶれが確認されなかった。
△：実用上問題はないが多少の印字欠け、印字流れ、印字つぶれが確認された。
×：ひどい印字欠け、印字流れ、印字つぶれが確認された。
(1) Print quality The obtained print samples were evaluated by checking visually for missing prints, print flow, and print crushing. The evaluation criteria were as follows. The evaluation results are shown in Table 2.
◯: Printing failure, printing flow, and printing crushing were not confirmed.
Δ: Although there was no problem in practical use, some printing defects, printing flow, and printing crushing were confirmed.
X: Severe printing defect, printing flow, and printing crushing were confirmed.
（２）擦過性
ＪＩＳ Ｌ ０８２３に準拠した擦過試験機（(株)安田精機製作所製の電動式ロックメータＮｏ．４１６−ＴＭＩ）の摩擦子の先端に貼り付けた直径１０．９ｍｍのスチールボールを印字面表面と接触させ、荷重レバーの端子荷重８８．２ｋPaで該表面上を往復摺動させた。スチールボールの３０回往復中の印字状態の変化を目視で観察した。以下の評価基準で評価した。その評価結果を表２に示す。
◎：印字に全く問題がなかった。
○：印字に問題はないがかすかに擦過された跡があった。
△：印字は判読可能であるが擦過により削り取られ薄くなっていた。
×：印字の判読不能。
(2) Friction property A steel ball having a diameter of 10.9 mm attached to the tip of a friction element of a fretting tester (electric lock meter No. 416-TMI manufactured by Yasuda Seiki Seisakusho Co., Ltd.) in accordance with JIS L 0823 It was brought into contact with the surface of the printing surface and slid back and forth on the surface with a terminal load of the load lever of 88.2 kPa. The change in the printing state during the reciprocation of the steel ball 30 times was visually observed. Evaluation was made according to the following evaluation criteria. The evaluation results are shown in Table 2.
A: There was no problem in printing.
○: There was no problem in printing, but there was a trace of rubbing.
(Triangle | delta): Although printing was legible, it was scraped off by abrasion and became thin.
×: Unreadable print.
（３）金属光沢
印字表面を目視により観察し、以下の評価基準で評価した。その結果を表２に示す。
◎：美麗な金属光沢
○：少々曇るが金属光沢に問題なし
△：金属光沢に曇りあり
×：つや消し状の金属光沢
(3) Metallic gloss The printed surface was visually observed and evaluated according to the following evaluation criteria. The results are shown in Table 2.
◎: Beautiful metallic luster ○: Slightly cloudy but no problem with metallic luster △: Metallic luster is cloudy ×: Matte metallic luster
本発明に係る熱転写媒体は、高輝度の金属光沢を有する文字や画像を印字するために好適に用いることができる。 The thermal transfer medium according to the present invention can be suitably used for printing characters and images having a high-brightness metallic luster.
Claims (1)
前記アンカー層が、ポリイソシアネートと一液性熱硬化型アクリル樹脂とを５０：５０〜８０：２０の配合割合（質量比）で含有すること、を特徴とする熱転写媒体。 A thermal transfer medium in which at least a release layer, an anchor layer, a metal layer, and an adhesive layer are provided in this order on a substrate,
The thermal transfer medium, wherein the anchor layer contains polyisocyanate and one-component thermosetting acrylic resin in a blending ratio (mass ratio) of 50:50 to 80:20.
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| JPH02112988A (en) * | 1988-10-22 | 1990-04-25 | Hitachi Maxell Ltd | Heat transfer recording medium |
| JP2650510B2 (en) * | 1991-06-19 | 1997-09-03 | 凸版印刷株式会社 | Transfer recording method and transfer object used in this method |
| JPH0592672A (en) * | 1991-09-30 | 1993-04-16 | Toppan Printing Co Ltd | Metal gloss thermal transfer recording medium |
| JPH0665348A (en) * | 1992-08-25 | 1994-03-08 | Dainippon Ink & Chem Inc | Thermosetting acryl-urethane resin composition |
| JPH06278373A (en) * | 1993-03-29 | 1994-10-04 | Dainippon Printing Co Ltd | Thermal transfer sheet |
| JPH09207463A (en) * | 1996-02-02 | 1997-08-12 | Dainippon Printing Co Ltd | Thermal transfer sheet |
| JP3066485B2 (en) * | 1997-03-14 | 2000-07-17 | 株式会社麗光 | High-brightness metallic glossy thermal transfer media |
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