JP5967703B2 - Transfer base film and method for producing the same - Google Patents
Transfer base film and method for producing the same Download PDFInfo
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- JP5967703B2 JP5967703B2 JP2012126828A JP2012126828A JP5967703B2 JP 5967703 B2 JP5967703 B2 JP 5967703B2 JP 2012126828 A JP2012126828 A JP 2012126828A JP 2012126828 A JP2012126828 A JP 2012126828A JP 5967703 B2 JP5967703 B2 JP 5967703B2
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Landscapes
- Decoration By Transfer Pictures (AREA)
- Laminated Bodies (AREA)
Description
本発明は、携帯電話のカバーケースや車の内装パネルなどの立体成形された被転写体に図柄等のインキ層を真空加圧熱転写法により転写をするために用いられる転写用基材フィルムに関するものである。 The present invention relates to a transfer substrate film used for transferring an ink layer such as a pattern to a three-dimensionally transferred object such as a cover case of a mobile phone or an interior panel of a car by a vacuum pressure thermal transfer method. It is.
従来、複雑な三次元形状を有する立体成形された被転写体に図柄を転写する方法として水圧転写法が知られている。この水圧転写法は、水面に図柄となるインキ層を浮かせ、このインキ層を被転写体の表面に付着させて転写する方法である。しかし、水圧転写法では転写精度が低く、高度な意匠表現が難しいという問題があった。 Conventionally, a hydraulic transfer method is known as a method for transferring a design to a three-dimensionally formed transfer target having a complicated three-dimensional shape. This water pressure transfer method is a method in which an ink layer serving as a design is floated on the surface of the water, and this ink layer is attached to the surface of a transfer medium for transfer. However, the hydraulic transfer method has a problem that transfer accuracy is low and it is difficult to express a high degree of design.
その問題を解決する方法として、真空加圧熱転写法が用いられている。この真空加圧熱転写法に用いる転写用基材フィルムとして、転写時のインキ層の剥離性に優れ、ポリエチレン系樹脂よりも融点が高く、柔軟性を有することから、ポリプロピレン系樹脂（エチレン−プロピレンランダム共重合体）が用いられていた（特許文献１参照）。 As a method for solving this problem, a vacuum pressure thermal transfer method is used. As a substrate film for transfer used in this vacuum pressure thermal transfer method, it is excellent in releasability of the ink layer at the time of transfer, has a melting point higher than that of polyethylene resin, and has flexibility, so that polypropylene resin (ethylene-propylene random) Copolymer) has been used (see Patent Document 1).
しかしながら、特許文献１に記載されたポリプロピレン系樹脂は高温雰囲気下であれば柔軟性が付与されるが、耐熱性に劣っているために、立体成形された被転写体に転写フィルムを追従させようとすると破れることにより満足する成形体が得られていなかった。 However, although the polypropylene resin described in Patent Document 1 is flexible in a high temperature atmosphere, it is inferior in heat resistance. Therefore, let the transfer film follow the three-dimensionally transferred object. As a result, a satisfactory molded product was not obtained by breaking.
本発明は上記問題に着目してなされたものであり、上記課題を解決しうる転写用基材フィルムの提供を目的とする。
本発明者らは、所定条件の転写用基材フィルムとすることにより上記課題を解決するに至った。
すなわち、本発明に係る転写用基材フィルムは、被転写体に転写されるインキ層が一方の面に印刷される転写用基材フィルムにおいて、前記転写用基材フィルムのインキ層が印刷される前記一方の面に中心線平均粗さＲａ（ＪＩＳ Ｂ ０６０１）で０.１〜５μmの凹凸構造が形成され、融点が１６１℃以上、ヤング率が３５０ＭＰａ以下、フィルムのＭＤ方向のヤング率とＴＤ方向のヤング率の関係（ＭＤ／ＴＤ）が０．９５＜ＭＤ／ＴＤ＜１．０５であることを特徴とする。
The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a transfer base film that can solve the above problems.
The inventors of the present invention have solved the above-mentioned problems by using a transfer substrate film under predetermined conditions.
That is, transfer base material film according to the present invention is a transfer base material film ink layer is transferred to the transfer body is printed on one side, the ink layer of the transfer base material film is printed An uneven structure having a centerline average roughness Ra (JIS B 0601) of 0.1 to 5 μm is formed on the one surface, the melting point is 161 ° C. or higher, the Young's modulus is 350 MPa or less, the Young's modulus in the MD direction of the film and TD The Young's modulus relationship (MD / TD) in the direction is 0.95 <MD / TD <1.05.
ここで、上記転写用基材フィルムの降伏点荷重が６．０Ｎ／ｃｍ以上であってもよい。
さらに、上記転写用基材フィルムが、７０〜５０重量％のホモポリプロピレンと、３０〜５０重量％の、融点が１４０〜１７０℃のプロピレン系エラストマーとからなるものとしてもよい。
また、上記転写用基材フィルムの少なくとも一方の面に凹凸構造が形成されていてもよい。
Here, the yield point load of the transfer base film may be 6.0 N / cm or more.
Furthermore, the transfer base film may be composed of 70 to 50% by weight of homopolypropylene and 30 to 50% by weight of a propylene-based elastomer having a melting point of 140 to 170 ° C.
Further, an uneven structure may be formed on at least one surface of the transfer base film.
本発明により、木目模様等の高精度図柄を印刷加工する転写用基材フィルムとして、破れにくく不必要に伸びず適正な抗張力を有するものが得られ、上記課題を解決しうる転写用基材フィルムが提供される。
特に、高精度図柄の印刷加工において、適正な抗張力を有し、支持体層のキャリアーが不要となり、転写時に適正な柔軟性(伸び−被転写体形状への追随性)及び耐熱性がある。
According to the present invention, as a transfer base film for printing a high-precision pattern such as a wood grain pattern, a transfer base film that is difficult to tear and has an appropriate tensile strength that does not unnecessarily stretch, can be obtained. Is provided.
In particular, in printing processing of high-accuracy patterns, it has an appropriate tensile strength, does not require a carrier for the support layer, and has an appropriate flexibility (elongation-followability to the shape of the transferred object) and heat resistance during transfer.
以下、本発明に係る転写用基材フィルムについて、実施の形態を説明する。
本発明に係る転写用基材フィルム２（図１（ａ）参照）は、携帯電話のカバーケースや車の内装パネルなどの立体成形された被転写体の化粧に用いられる転写フィルム１の一部をなすもので、インキ層３の基材として機能する（図１（ｂ）参照）。
本発明に係る転写用基材フィルム２は、被転写体に転写されるインキ層３が一方の面に印刷されるものであって、（ａ）融点が１６１℃以上、（ｂ）ヤング率が３５０ＭＰａ以下、（ｃ）フィルムのＭＤ方向のヤング率とＴＤ方向のヤング率の関係（ＭＤ／ＴＤ）が０．９５＜ＭＤ／ＴＤ＜１．０５を満たすものである。
Hereinafter, embodiments of the transfer base film according to the present invention will be described.
The transfer base film 2 (see FIG. 1 (a)) according to the present invention is a part of a transfer film 1 used for makeup of a three-dimensional object to be transferred such as a cover case of a mobile phone or an interior panel of a car. It functions as a base material for the ink layer 3 (see FIG. 1B).
The substrate film for transfer 2 according to the present invention is one in which the ink layer 3 transferred to the transfer medium is printed on one surface, and (a) the melting point is 161 ° C. or higher, and (b) the Young's modulus is 350 MPa or less, (c) The relationship between the Young's modulus in the MD direction and the Young's modulus in the TD direction (MD / TD) satisfies 0.95 <MD / TD <1.05.
＜転写用基材フィルムの融点＞
転写用基材フィルム２の融点が１６１℃以上であれば、２〜１０気圧、１００〜１４０℃の条件で行われる真空加圧熱転写法による加熱処理時に転写フィルム１の破れや溶融が起こらず、転写が可能である。転写用基材フィルム２の融点が１６１℃未満であると、同条件の転写の加熱処理時に転写フィルム１の破れや溶融が起きて転写ができなくなる。
<Melting point of substrate film for transfer>
If the melting point of the transfer base film 2 is 161 ° C. or higher, the transfer film 1 is not broken or melted during the heat treatment by the vacuum pressure thermal transfer method performed under the conditions of 2 to 10 atm and 100 to 140 ° C., Transcription is possible. When the transfer substrate film 2 has a melting point of less than 161 ° C., the transfer film 1 is torn or melted during the heat treatment for transfer under the same conditions, and transfer cannot be performed.
転写用基材フィルム２の融点については、１６１℃以上の範囲において、被転写体９（図６参照）の耐熱温度に併せて設定される転写時の温度条件よりも高い融点に設定することで、転写時に転写フィルム１の破れや溶融が起きなくなる。 About the melting | fusing point of the base film 2 for transfer, in the range of 161 degreeC or more, by setting to melting | fusing point higher than the temperature conditions at the time of the transfer set according to the heat-resistant temperature of the to-be-transferred body 9 (refer FIG. 6). The transfer film 1 is not torn or melted during transfer.
転写フィルム１は、図１（ｂ）に示すように、転写用基材フィルム２にインキ層３を設けたものであるため、転写用基材フィルム２の融点と略同じとなる。 As shown in FIG. 1B, the transfer film 1 is obtained by providing the transfer base film 2 with the ink layer 3, and therefore has substantially the same melting point as that of the transfer base film 2.
転写用基材フィルム２の融点は、特にコポリマーより融点が高いホモポリマーの配合割合により調整することが好ましい。 The melting point of the transfer substrate film 2 is preferably adjusted by the blending ratio of a homopolymer having a melting point higher than that of the copolymer.
＜転写用基材フィルムのヤング率＞
転写用基材フィルム２のヤング率（ＭＰａ）は、３５０ＭＰａ以下であることが好ましい。さらには、１１０〜３５０ＭＰａであることが好ましい。
<Young's modulus of substrate film for transfer>
The Young's modulus (MPa) of the transfer base film 2 is preferably 350 MPa or less. Furthermore, it is preferable that it is 110-350 MPa.
ヤング率が３５０ＭＰａ以下であると、転写時に転写フィルム１が適度に延びるので被転写体９へのインキ層３の転写が可能となる。 When the Young's modulus is 350 MPa or less, the transfer film 1 extends appropriately at the time of transfer, so that the ink layer 3 can be transferred to the transfer target 9.
転写用基材フィルム２のヤング率（ＭＰａ）が３５０ＭＰａより大きくなると、転写フィルム１の上記条件下での転写で転写フィルム１が延びずに綺麗に転写することができなくなる。 When the Young's modulus (MPa) of the transfer base film 2 is greater than 350 MPa, the transfer film 1 does not extend by the transfer under the above conditions of the transfer film 1 and cannot be transferred cleanly.
なお、転写用基材フィルム２のヤング率は、樹脂構成やそれらの配合割合（重量％）により調整できる。 The Young's modulus of the transfer base film 2 can be adjusted by the resin configuration and the blending ratio (% by weight) thereof.
転写用基材フィルム２のＭＤ方向（フィルムの流れ方向）及びＴＤ方向（フィルムの幅方向）のヤング率の関係（ＭＤ／ＴＤ）については、０．９５＜ＭＤ／ＴＤ＜１．０５であれば、転写時に図柄が歪まず綺麗に転写することができる。逆に、上記範囲から外れると、転写時に一方向に図柄が歪んでしまい、成形体５（図７（ｂ）参照）の転写図柄が綺麗ではなくなる。 Regarding the relationship (MD / TD) of the Young's modulus in the MD direction (film flow direction) and TD direction (film width direction) of the transfer base film 2, it should be 0.95 <MD / TD <1.05. For example, the pattern can be transferred cleanly without distortion. On the contrary, if it is out of the above range, the pattern is distorted in one direction at the time of transfer, and the transferred pattern of the molded body 5 (see FIG. 7B) is not clean.
ここで、転写用基材フィルム２の製造時に一方向（ＭＤ方向またはＴＤ方向）に延伸をすることで、転写用基材フィルム２のＭＤ方向及びＴＤ方向のヤング率を調整することができ、転写用基材フィルム２のヤング率の関係（ＭＤ／ＴＤ）を、０．９５＜ＭＤ／ＴＤ＜１．０５とすることができる。 Here, the Young's modulus in the MD direction and the TD direction of the transfer base film 2 can be adjusted by stretching in one direction (MD direction or TD direction) during the manufacture of the transfer base film 2. The Young's modulus relationship (MD / TD) of the transfer base film 2 can be set to 0.95 <MD / TD <1.05.
＜降伏点荷重＞
転写用基材フィルム２の降伏点荷重については、６．０Ｎ／ｃｍ以上であれば、インキ層３を転写用基材フィルム２に印刷して得られる転写フィルム１をロール状に巻いた際にシワが発生しにくいものとなる。
<Yield point load>
When the yield point load of the transfer base film 2 is 6.0 N / cm or more, the transfer film 1 obtained by printing the ink layer 3 on the transfer base film 2 is wound into a roll. Wrinkles are less likely to occur.
逆に、降伏点荷重が６．０Ｎ／ｃｍ未満であると、転写用基材フィルム２に所定の張力を加えた状態でインキ層３を印刷する際に、転写用基材フィルム２がネッキングを起こしやすく、転写用基材フィルム２に印刷した図柄が歪みやすくなり、その場合、印刷後の転写フィルム１をロール状に巻いたときに皺が発生しやすくなる。 On the other hand, when the yield point load is less than 6.0 N / cm, when the ink layer 3 is printed in a state where a predetermined tension is applied to the transfer base film 2, the transfer base film 2 is necked. The pattern printed on the transfer base film 2 is easily distorted, and in this case, wrinkles are likely to occur when the printed transfer film 1 is rolled.
また、転写用基材フィルム２は、前記の特定の融点、特定のヤング率及び特定のヤング率の関係（ＭＤ／ＴＤ）であれば、転写用基材フィルム２に使用する樹脂は適宜選択することができる。 Moreover, if the base film 2 for transfer is the said specific melting | fusing point, the specific Young's modulus, and the relationship (MD / TD) of a specific Young's modulus, the resin used for the base film 2 for transfer will be selected suitably. be able to.
転写用基材フィルム２は従来の公知の方法で製膜することができ、特にＴダイキャスト法で製膜することが好ましい。前記Ｔダイキャスト法で製膜すると、転写用基材フィルム２のヤング率（ＭＤ方向）とヤング率（ＴＤ方向）の関係が０．９５＜ＭＤ／ＴＤ＜１．０５であるフィルムを得ることが容易である。 The substrate film for transfer 2 can be formed by a conventionally known method, and it is particularly preferable to form the film by a T-die casting method. When the film is formed by the T-die casting method, a film in which the relationship between the Young's modulus (MD direction) and the Young's modulus (TD direction) of the transfer base film 2 is 0.95 <MD / TD <1.05 is obtained. Is easy.
また、転写用基材フィルム２の表面には凹凸を設けても良い。例えば、梨地模様や紋模様等の凹凸構造を転写用基材フィルム２の裏面（転写される側とは反対側の転写フィルム１の面）に設ければ、転写用基材フィルム２や転写フィルム１をロール状に巻き取る際に耐ブロッキング性やフィルムの滑り性を向上することができる。 Further, the surface of the transfer base film 2 may be provided with unevenness. For example, if an uneven structure such as a satin pattern or a pattern is provided on the back surface of the transfer base film 2 (the surface of the transfer film 1 opposite to the transfer side), the transfer base film 2 or transfer film When winding 1 in a roll shape, the blocking resistance and the slipperiness of the film can be improved.
また、凹凸構造をインキ層３に接する側の転写用基材フィルム２の面に設ければ、印刷や塗工等でインキ層３を形成する際に、毛細管現象等によって、そのインキや塗液の転移性を良好にすることもできる。 In addition, if the concavo-convex structure is provided on the surface of the transfer base film 2 on the side in contact with the ink layer 3, when the ink layer 3 is formed by printing, coating or the like, the ink or coating liquid is caused by a capillary phenomenon or the like. It is also possible to improve the transferability.
ここで、凹凸構造をインキ層３の印刷内容（文字や図柄）の印刷位置に合わせて転写用基材フィルム２に設けてもよい。これら耐ブロッキング性や転移性向上のための凹凸構造は、中心線平均粗さRａ（ＪＩＳ Ｂ ０６０１）で０．１〜５μｍ程度の凹凸が良好な結果を与える。 Here, the concavo-convex structure may be provided on the transfer base film 2 in accordance with the printing position of the printing content (characters and designs) of the ink layer 3. The concavo-convex structure for improving the blocking resistance and the transfer property gives a favorable result that the concavo-convex of about 0.1 to 5 μm in the center line average roughness Ra (JIS B 0601).
また、転写用基材フィルム２の表面に凹凸を形成する方法は、特に限定されないが、転写用基材フィルム２を製膜と同時又は製膜後に別に形成してもよい。 In addition, the method of forming irregularities on the surface of the transfer base film 2 is not particularly limited, but the transfer base film 2 may be formed separately from the film formation or after film formation.
[転写用基材フィルム]
転写用基材フィルム２は、上記数値条件を満たせばどの樹脂素材であっても構わないが、例えば、主としてホモポリプロピレン（以下、ホモＰＰと称することがある。）と、プロピレン系エラストマー（以下、ＰＰ系エラストマーと称することがある。）とからなるものを好適に用いることができる。
このようにすることで、多層フィルムとしなくても、単層であっても転写フィルム１のインキ層３に対する剥離性を両立させることができる。つまり、支持体層を併設しなくとも転写可能な転写フィルムが得られる。
また、転写用基材フィルム２にホモＰＰを用いることで、インキ層３に対する剥離性が高いものとなる。
[Transfer base film]
The transfer base film 2 may be any resin material as long as the above numerical conditions are satisfied. For example, homopolypropylene (hereinafter sometimes referred to as homo-PP) and propylene-based elastomer (hereinafter referred to as homo-PP). What is sometimes referred to as a PP-based elastomer) can be suitably used.
By doing in this way, even if it is not a multilayer film, even if it is a single layer, the peelability with respect to the ink layer 3 of the transfer film 1 can be made compatible. That is, a transfer film that can be transferred without providing a support layer is obtained.
Moreover, by using homo PP for the transfer base film 2, the releasability from the ink layer 3 is high.
＜ホモＰＰ＞
転写用基材フィルム２に好適に用いられるホモポリプロピレンは、プロピレンの単独重合体である。このホモポリプロピレンを用いることによって耐熱性に優れている転写用基材フィルム２が得られる。ホモポリプロピレンではなく、ポリマーの構成単位としてエチレン等の他のモノマーを含むポリプロピレン共重合体の場合、転写用基材フィルム２の融点が下がって、転写用基材フィルム２の耐熱適性が低下するので好ましくない。また、ホモポリプロピレンを用いることによってインキ層３に対する剥離性が高いものとなる。
<Homo PP>
Homopolypropylene suitably used for the transfer substrate film 2 is a homopolymer of propylene. By using this homopolypropylene, a transfer base film 2 having excellent heat resistance can be obtained. In the case of a polypropylene copolymer containing other monomers such as ethylene as a polymer structural unit instead of homopolypropylene, the melting point of the transfer base film 2 is lowered, and the heat resistance of the transfer base film 2 is lowered. It is not preferable. Further, by using homopolypropylene, the releasability from the ink layer 3 becomes high.
＜ＰＰ系エラストマー＞
一方、転写用基材フィルム２に好適に用いられるＰＰ系エラストマーは、プロピレンと、エチレンおよびα−オレフィン（プロピレンを除く）の中から選ばれた一種以上のモノマーと共重合した共重合体が好ましく、α−オレフィンの具体例としては、ブテン、ペンテンヘキセン、ヘプテン、オクテン、デセン、ドデセン等が挙げられ、これらのランダム共重合体やブロック共重合体が好ましい。
<PP elastomer>
On the other hand, the PP elastomer suitably used for the transfer substrate film 2 is preferably a copolymer obtained by copolymerization with propylene and one or more monomers selected from ethylene and α-olefin (excluding propylene). Specific examples of the α-olefin include butene, pentenehexene, heptene, octene, decene, dodecene and the like, and these random copolymers and block copolymers are preferable.
ＰＰ系エラストマーの製造には、チーグラーナッタ触媒やメタロセン触媒等が用いられる。メタロセン触媒は、ポリマーの分子構造を精密に設計でき、ポリマーの微細構造や共重合性を自由にコントロールでき、本発明で用いられるＰＰ系エラストマーに要求される耐熱性と柔軟性を付与することができる。従って、本発明で用いられるＰＰ系エラストマーはメタロセン触媒を用いて製造されたＰＰ系エラストマーを用いることが望ましい。 A Ziegler-Natta catalyst, a metallocene catalyst, or the like is used for the production of the PP-based elastomer. The metallocene catalyst can precisely design the molecular structure of the polymer, can freely control the fine structure and copolymerization of the polymer, and can provide the heat resistance and flexibility required for the PP elastomer used in the present invention. it can. Accordingly, it is desirable that the PP elastomer used in the present invention is a PP elastomer produced using a metallocene catalyst.
転写用基材フィルム２に用いられるＰＰ系エラストマーの融点は、１４０℃〜１７０℃が好ましく、さらには１５０℃〜１６５℃が好ましい。ＰＰ系エラストマーの融点が１４０℃を下回る場合は、真空加圧熱転写する際の熱によって転写用基材フィルム２が収縮・変形し、図柄のインキ層３が綺麗に転写できなくなるので好ましくない。 The melting point of the PP elastomer used for the transfer substrate film 2 is preferably 140 ° C to 170 ° C, and more preferably 150 ° C to 165 ° C. When the melting point of the PP-based elastomer is lower than 140 ° C., the transfer base film 2 contracts and deforms due to heat during vacuum pressure heat transfer, and the design ink layer 3 cannot be transferred cleanly.
なお、ＰＰ系エラストマーの融点は、ＪＩＳ Ｋ−７１２１に準拠し、示差走査熱量測定機（ＤＳＣ）を用いて測定した。すなわち、加熱速度毎分２０℃で融解終了時よりも約３０℃高い温度まで加熱し１０分間保った後、出現する融点のピークより５０℃以上低い温度まで冷却速度毎分１０℃で冷却し、次いで、装置を安定させ加熱速度毎分１０℃で融解ピーク（吸熱ピーク）終了時より約３０℃高い温度まで加熱して、吸熱ピークの温度を融点とした。 The melting point of the PP elastomer was measured using a differential scanning calorimeter (DSC) according to JIS K-7121. That is, after heating at a heating rate of 20 ° C. per minute to a temperature approximately 30 ° C. higher than that at the end of melting and maintaining for 10 minutes, cooling at a cooling rate of 10 ° C. per minute to a temperature that is 50 ° C. lower than the peak of the melting point that appears, The apparatus was then stabilized and heated at a heating rate of 10 ° C. per minute to a temperature about 30 ° C. higher than the end of the melting peak (endothermic peak), and the endothermic peak temperature was taken as the melting point.
ＰＰ系エラストマーの硬度は、ショアＡ硬度６５〜９０の柔軟性を有するものが好ましい。なお、ＰＰ系エラストマーのショアＡ硬度は、ＡＳＴＭ Ｄ２２４０に準拠して測定した。 The PP elastomer preferably has a shore A hardness of 65 to 90. The Shore A hardness of the PP-based elastomer was measured in accordance with ASTM D2240.
ＰＰ系エラストマーのＭＦＲは、２ｇ／１０ｍｉｎ〜５０ｇ／１０ｍｉｎが好ましい。ＭＦＲが２ｇ／１０ｍｉｎ未満の場合は、溶融粘度が高すぎて押出し成形が困難となる。ＭＦＲが５０ｇ／１０ｍｉｎを超える場合は、溶融粘度が小さすぎて均一な厚さのフィルムを得るのが困難となる。 The MFR of the PP elastomer is preferably 2 g / 10 min to 50 g / 10 min. If the MFR is less than 2 g / 10 min, the melt viscosity is too high and extrusion molding becomes difficult. When MFR exceeds 50 g / 10 min, it becomes difficult to obtain a film having a uniform thickness because the melt viscosity is too small.
以上、ＰＰ系エラストマー樹脂としては、上記物性を満たすものであれば特に制限はないが、例えば市販されているものを用いてもよい。市販されているＰＰ系エラストマーとしては、「タフマー」（登録商標）等を好適に用いることができるが、これに制限されるものではない。 As described above, the PP-based elastomer resin is not particularly limited as long as it satisfies the above physical properties. For example, a commercially available resin may be used. As the commercially available PP-based elastomer, “Tuffmer” (registered trademark) or the like can be suitably used, but the present invention is not limited thereto.
転写用基材フィルム２のホモＰＰとＰＰ系エラストマーの配合割合（重量％）については、ホモＰＰ：ＰＰ系エラストマー＝７０〜５０：３０〜５０とすることが好ましい。前記配合割合にすることによって、耐熱性と柔軟性に優れた転写用基材フィルム２を得ることができる。 The blending ratio (% by weight) of the homo PP and PP elastomer in the transfer base film 2 is preferably homo PP: PP elastomer = 70-50: 30-50. By setting the blending ratio, a transfer base film 2 excellent in heat resistance and flexibility can be obtained.
転写用基材フィルム２の厚さ（μｍ）については、転写する被転写体９の形状等の用途に応じて厚さを適宜選定することができるが、転写用基材フィルム２の柔軟性と成形性の関係から３０μｍ〜１５０μｍとすることが好ましい。転写用基材フィルム２の厚さが３０μｍ未満の場合、薄いために転写用基材フィルム２を製膜しにくくなり、１５０μｍを超えると柔軟性を満足する転写用基材フィルム２を製膜することができない。 The thickness (μm) of the transfer base film 2 can be appropriately selected according to the use such as the shape of the transfer target 9 to be transferred. It is preferable to set it as 30 micrometers-150 micrometers from the relationship of a moldability. When the thickness of the transfer base film 2 is less than 30 μm, it is difficult to form the transfer base film 2 because it is thin, and when it exceeds 150 μm, the transfer base film 2 satisfying flexibility is formed. I can't.
また、転写用基材フィルム２は上記のホモＰＰとＰＰ系エラストマーを用いた場合は、ウレタン系樹脂などからなる支持体層を設けることなく、単層で柔軟性と剥離性を満足するものである。 In addition, when the above-mentioned homo-PP and PP-based elastomer are used, the transfer base film 2 satisfies the flexibility and peelability with a single layer without providing a support layer made of urethane-based resin or the like. is there.
（転写フィルム）
転写フィルム１は、インキ層３、本発明に係る転写用基材フィルム２により構成されている。転写フィルム１は、被転写体９に木目模様や文字等の図柄を転写するために用いられるものである。
(Transfer film)
The transfer film 1 includes an ink layer 3 and a transfer base film 2 according to the present invention. The transfer film 1 is used for transferring a design such as a wood grain pattern or characters to the transfer body 9.
＜転写フィルム１の製造方法＞
転写フィルム１は、前記したＴダイキャスト法により転写用基材フィルム２を製膜して形成する工程、その後、インキ層３を転写用基材フィルム２の一方の面に形成する工程により製造される。
＜インキ層３＞
インキ層３は、例えば、グラビア印刷、オフセット印刷、インクジェットプリント等の従来公知の方法で設けることができる。また、図柄は用途に合わせて、木目模様、石目模様、布目模様、タイル調模様、煉瓦調模様、皮絞模様、文字、幾何学模様等を用いることができる。
<Method for producing transfer film 1>
The transfer film 1 is manufactured by the process of forming the transfer base film 2 by the above-described T die casting method, and then the process of forming the ink layer 3 on one surface of the transfer base film 2. The
<Ink layer 3>
The ink layer 3 can be provided by a conventionally known method such as gravure printing, offset printing, and inkjet printing. Moreover, according to a use, a grain pattern, a stone pattern, a cloth pattern, a tile tone pattern, a brick tone pattern, a leather pattern, a character, a geometric pattern etc. can be used for a design.
図柄となるインキ層３（図１参照）は、従来公知のインキを用いることができ、顔料や染料などの着色剤とバインダー等からなるビヒクルなどからなる。バインダーで使用する樹脂は、セルロース誘導体、スチレン樹脂、スチレン共重合樹脂、アクリル樹脂、メタクリル樹脂、ロジンエステル樹脂、ポリ酢酸ビニル樹脂、ポリ塩化ビニル、塩化ビニル・酢酸ビニル共重合体、ポリエステル樹脂、ポリウレタン樹脂、ブチラール樹脂、ポリアミド樹脂の１種又は２種以上を用いることができる。また、着色材としては、チタン白、カーボンブラック、弁柄、黄鉛、群青等の無機顔料、アニリンブラック、キナクリドン、イソインドリノン、フタロシアニンブルー等の有機顔料或いはその他染料等を用いることができる。 A known ink can be used for the ink layer 3 (see FIG. 1), which is a design, and includes a vehicle composed of a colorant such as a pigment or a dye and a binder. Resin used in binder is cellulose derivative, styrene resin, styrene copolymer resin, acrylic resin, methacrylic resin, rosin ester resin, polyvinyl acetate resin, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, polyester resin, polyurethane One or more of a resin, a butyral resin, and a polyamide resin can be used. In addition, as the colorant, inorganic pigments such as titanium white, carbon black, dial, chrome lead and ultramarine, organic pigments such as aniline black, quinacridone, isoindolinone and phthalocyanine blue, or other dyes can be used.
[被転写体]
転写フィルム１のインキ層３が転写される被転写体９（図６参照）は、特に限定されるものではない。例えば、ポリプロピレン系樹脂、塩化ビニル樹脂、フェノール樹脂、ＡＢＳ樹脂、ポリエチレンテレフタレート系樹脂、ポリカーボネート系樹脂等の樹脂からなる被転写体が特に好ましい。
[Transfer]
The transfer target 9 (see FIG. 6) to which the ink layer 3 of the transfer film 1 is transferred is not particularly limited. For example, a transfer body made of a resin such as a polypropylene resin, a vinyl chloride resin, a phenol resin, an ABS resin, a polyethylene terephthalate resin, or a polycarbonate resin is particularly preferable.
さらに、被転写体９の形状は平板、曲面板、棒状体、立体物等でも良い。また、被転写面は、平面以外にも、凹凸構造を表面に有するものでも良い。図６に示すような凹凸構造を有する表面でも破れ等なく転写可能である（後述の実施例参照）。 Furthermore, the shape of the transfer target 9 may be a flat plate, a curved plate, a rod-shaped body, a three-dimensional object, or the like. In addition to the flat surface, the transferred surface may have a concavo-convex structure on the surface. Even a surface having a concavo-convex structure as shown in FIG. 6 can be transferred without tearing or the like (see examples described later).
[転写方法]
本発明に係る転写フィルム１を用いて、被転写体９の表面に図柄を転写する方法について説明する。
[Transfer method]
A method for transferring a pattern onto the surface of the transfer target 9 using the transfer film 1 according to the present invention will be described.
本発明における転写方法は、真空加圧熱転写法の工程、及び転写用基材フィルム２の剥離工程を、この順に行うことを特徴としている。 The transfer method in the present invention is characterized in that the steps of the vacuum pressure thermal transfer method and the peeling step of the transfer base film 2 are performed in this order.
＜真空加圧熱転写法の工程＞
真空加圧熱転写工程は、図２（ａ）〜（ｃ）に示すように、転写フィルム１を用いて、被転写体９の表面に図柄となるインキ層３を転写する方法である。
<Process of vacuum pressure thermal transfer method>
The vacuum-pressurized thermal transfer process is a method of transferring the ink layer 3 as a pattern onto the surface of the transfer target 9 using the transfer film 1 as shown in FIGS.
真空加圧熱転写工程では、図２に示すような転写装置を使用する。この転写装置は、上部と下部の各チャンバー６、７を中心にして構成されている。 In the vacuum pressure thermal transfer process, a transfer device as shown in FIG. 2 is used. This transfer apparatus is configured around the upper and lower chambers 6 and 7.
上チャンバー６は、駆動装置８Ｂにより上下に駆動される。上チャンバー６の内上面にはヒータＨが複数設けられている。一方、下チャンバー７内には支持台１０が配置されている。支持台１０は駆動装置８Ａにより上下に駆動される。また、上チャンバー６および下チャンバー７には制圧手段としての真空ポンプ１２、電磁バルブ４および圧縮ガスボンベ１１等が接続されている。 The upper chamber 6 is driven up and down by a driving device 8B. A plurality of heaters H are provided on the inner upper surface of the upper chamber 6. On the other hand, a support base 10 is disposed in the lower chamber 7. The support base 10 is driven up and down by the drive device 8A. The upper chamber 6 and the lower chamber 7 are connected to a vacuum pump 12, a solenoid valve 4, a compressed gas cylinder 11, and the like as pressure control means.
次に、この転写装置を用いたインキ層３の真空加圧熱転写法の工程を説明する。
最初に、図２（ａ）に示すように、支持台１０に被転写体９をセットする。次に、転写フィルム１を、インキ層３が被転写体９に対向するようにして、被転写体９の上方にセットする。なお、インキ層３または被転写体９の表面には接着剤（図示せず）が塗布される。
Next, the steps of the vacuum pressure thermal transfer method of the ink layer 3 using this transfer device will be described.
First, as shown in FIG. 2A, the transfer body 9 is set on the support base 10. Next, the transfer film 1 is set above the transferred body 9 so that the ink layer 3 faces the transferred body 9. An adhesive (not shown) is applied to the surface of the ink layer 3 or the transfer target 9.
次に、図２（ｂ）に示すように、上チャンバー６を駆動装置８Ｂにより下降させて下チャンバー７に密着させ、チャンバー６、７内を密閉状態にする。 Next, as shown in FIG. 2B, the upper chamber 6 is lowered by the driving device 8B and brought into close contact with the lower chamber 7, and the chambers 6 and 7 are sealed.
そして、支持台１０を駆動装置８Ａにより上昇させて被転写体９を転写フィルム１に向けて押し上げることにより、被転写体９を転写フィルム１に当接させる。 Then, the transfer base 9 is brought into contact with the transfer film 1 by raising the support base 10 by the driving device 8 </ b> A and pushing up the transfer target 9 toward the transfer film 1.
続いて、真空ポンプ１２を作動させて上チャンバー６内および下チャンバー７内の空間Ｓを真空状態にまで減圧する。その後、上チャンバー６内を再び大気圧に戻すか、又は加圧状態とすることによって、転写フィルム１が被転写体９の細部にまで進入するように回り込み、転写フィルム１が被転写体９に密着する。 Subsequently, the vacuum pump 12 is operated to depressurize the space S in the upper chamber 6 and the lower chamber 7 to a vacuum state. Thereafter, the inside of the upper chamber 6 is returned to atmospheric pressure or is brought into a pressurized state, so that the transfer film 1 wraps around to the details of the transfer body 9, and the transfer film 1 enters the transfer body 9. In close contact.
続いて、ヒータＨを作動して転写フィルム１を加熱して上下のチャンバー６，７内が１００〜１４０℃となるまで加熱され、上チャンバー６内を２〜１０気圧まで加圧する。
このとき、転写フィルム１のインキ層３の表面又は被転写体９の表面に塗布した接着剤等により接着され、転写フィルム１のインキ層３の表面が被転写体９に接着し、実質的にインキ層３、転写用基材フィルム２が被転写体９に転写される。
Subsequently, the transfer film 1 is heated by operating the heater H so that the upper and lower chambers 6 and 7 are heated to 100 to 140 ° C., and the upper chamber 6 is pressurized to 2 to 10 atm.
At this time, the surface of the ink layer 3 of the transfer film 1 or the surface of the transferred body 9 is adhered by an adhesive or the like, and the surface of the ink layer 3 of the transfer film 1 adheres to the transferred body 9, substantially. The ink layer 3 and the transfer base film 2 are transferred to the transfer target 9.
続いてヒータＨの作動を停止すると共に、上チャンバー６及び下チャンバー７内を大気圧に戻して、被転写体９と転写フィルム１とを冷却する。 Subsequently, the operation of the heater H is stopped and the inside of the upper chamber 6 and the lower chamber 7 is returned to the atmospheric pressure to cool the transfer target 9 and the transfer film 1.
＜転写用基材フィルムの剥離工程＞
最後に、図２（ｃ）に示すように、転写用基材フィルム２の剥離工程は、上チャンバー６を駆動装置８Ｂにより上昇させて、被転写体９と転写フィルム１を取り出す。そして、転写用基材フィルム２をインキ層３から剥がす。これによりインキ層３が被転写体９に残り転写される。さらに、インキ層３のトリミングを行い成形体５が完成する。
<Transfer substrate film peeling process>
Finally, as shown in FIG. 2C, in the peeling process of the transfer base film 2, the upper chamber 6 is raised by the driving device 8B, and the transfer target 9 and the transfer film 1 are taken out. Then, the transfer base film 2 is peeled off from the ink layer 3. As a result, the ink layer 3 remains on the transfer medium 9 and is transferred. Further, the ink layer 3 is trimmed to complete the formed body 5.
[後加工]
なお、転写後の成形体５の表面には、必要に応じ適宜、耐久性、意匠表現等を付与する為に、更に透明保護層等の従来公知の上塗り層を塗装法等で形成してもよい。
[Post-processing]
In addition, on the surface of the molded body 5 after transfer, a conventionally known topcoat layer such as a transparent protective layer may be further formed by a coating method or the like in order to impart durability, design expression and the like as appropriate. Good.
[成形体の用途]
上記工程で得られる成形体５は、転写された装飾面が凹凸構造を有するもの、特に三次元形状等の凹凸構造を表面に有する物品であり、各種用途に用いられる。例えば、携帯電話のカバーケース、車の内装パネル、石鹸置きのケース、ペン立て等である。
[Use of molded body]
The molded body 5 obtained in the above process is an article having a transferred decorative surface having an uneven structure, particularly an article having an uneven structure such as a three-dimensional shape on the surface, and is used for various applications. For example, a mobile phone cover case, a car interior panel, a soap holder case, and a pen stand.
以下、本発明に係る転写用基材フィルム２の実施例について説明する。
[実施例１]
図３に示すように、Ｔダイキャスト法により転写用基材フィルム２を製膜した。
具体的には、６０重量％のホモＰＰ（密度：０．９００ｇ／ｃｍ３、融点：１６０℃、ＭＩ：２．１ｇ／１０ｍｉｎ）と、４０重量％のＰＰ系エラストマー（密度：０．８６８ｇ／ｃｍ３、融点：１４１℃、ＭＩ：６．０ｇ／１０ｍｉｎ、ショアＡ硬度：８２）とからなる樹脂をＴダイから溶融状態で押出し、凹凸表面を有する金属ローラ１３とシリコンローラ１４によりニップ成形することで厚さ７０μmの両面梨地の転写用基材フィルム２を得た。
その後、図４に示すように、インキ層３をグラビア印刷で形成した。具体的には、まず、シリンダ１６を回転させて、シリンダ１６の一部をインキ溜め１８に浸すことで、セル（版面のくぼみ）にインキを満たした。次に、版面にドクターブレード１５を圧着させて、セルに詰まったインキ以外の不必要なインキを削ぎ落とした。
次に、転写用基材フィルム２を圧着ローラ１９とシリンダ１６との間に挟み込ませ、転写用基材フィルム２の一方の面にインキが均一に転着するように、圧着ローラ１９によりシリンダ１６上で転写用基材フィルム２を下方に押下し（白抜矢印）、シリンダ１６の各セルから転写用基材フィルム２にインキを転着させた。転着後、転写用基材フィルム２を乾燥機１７内に通過および乾燥させてインキ層３を形成し、転写フィルム１を得た。
得られた転写フィルム１を用いて、真空加圧熱転写法の工程にて被転写体９に図柄となるインキ層３を転写し、評価した。
なお、転写用基材フィルム２の融点、ヤング率、ヤング率の関係（ＭＤ／ＴＤ）及び降伏点荷重や評価結果は、他の実施例及び比較例を含めて表１に示す。
Examples of the transfer base film 2 according to the present invention will be described below.
[Example 1]
As shown in FIG. 3, the transfer base film 2 was formed by T-die casting.
Specifically, 60 wt% homo PP (density: 0.900 g / cm 3 , melting point: 160 ° C., MI: 2.1 g / 10 min) and 40 wt% PP elastomer (density: 0.868 g / cm 2). A resin composed of cm 3 , melting point: 141 ° C., MI: 6.0 g / 10 min, Shore A hardness: 82) is extruded from a T-die in a molten state, and nip-formed by a metal roller 13 and a silicon roller 14 having an uneven surface. Thus, a transfer base film 2 having a thickness of 70 μm on both sides was obtained.
Then, as shown in FIG. 4, the ink layer 3 was formed by gravure printing. Specifically, first, the cylinder 16 was rotated, and a part of the cylinder 16 was immersed in the ink reservoir 18 to fill the cells (plate surface depressions) with ink. Next, the doctor blade 15 was pressure-bonded to the plate surface, and unnecessary ink other than the ink clogged in the cells was scraped off.
Next, the transfer base film 2 is sandwiched between the pressure roller 19 and the cylinder 16, and the cylinder 16 is moved by the pressure roller 19 so that the ink is uniformly transferred to one surface of the transfer base film 2. The transfer base film 2 was pressed downward (open arrow), and ink was transferred from each cell of the cylinder 16 to the transfer base film 2. After the transfer, the transfer base film 2 was passed through the dryer 17 and dried to form the ink layer 3, whereby the transfer film 1 was obtained.
Using the obtained transfer film 1, the ink layer 3 serving as a design was transferred to the transfer body 9 in the vacuum pressurization thermal transfer process and evaluated.
The relationship between the melting point, Young's modulus, Young's modulus (MD / TD), yield point load and evaluation results of the transfer base film 2 are shown in Table 1 including other examples and comparative examples.
[実施例２]
実施例１で、樹脂の配合割合を、ホモＰＰを６５重量％、ＰＰ系エラストマーを３５重量％とした以外は、実施例１と同様にして転写フィルム１を得た。更に、実施例１と同様の転写方法で転写した。
[Example 2]
A transfer film 1 was obtained in the same manner as in Example 1 except that the blending ratio of the resin was 65% by weight of homo-PP and 35% by weight of PP-based elastomer. Further, the image was transferred by the same transfer method as in Example 1.
[実施例３]
実施例１で、転写用基材フィルム２の厚さを９０μｍとした以外は、実施例１と同様にして転写フィルム１を得た。更に、実施例１と同様の転写方法で転写した。
[Example 3]
A transfer film 1 was obtained in the same manner as in Example 1 except that the thickness of the transfer base film 2 was 90 μm in Example 1. Further, the image was transferred by the same transfer method as in Example 1.
[実施例４]
実施例１で、樹脂の配合割合を、ホモＰＰを５０重量％、ＰＰ系エラストマーを５０重量％、転写用基材フィルム２の厚さを１００μｍとした以外は、実施例１と同様にして転写フィルム１を得た。更に、実施例１と同様の転写方法で転写した。
[Example 4]
Transferring in the same manner as in Example 1 except that the blending ratio of the resin in Example 1 was 50% by weight of homo PP, 50% by weight of PP elastomer, and the thickness of the transfer base film 2 was 100 μm. Film 1 was obtained. Further, the image was transferred by the same transfer method as in Example 1.
[実施例５]
実施例１で、転写用基材フィルム２の厚さを８０μｍとした以外は、実施例１と同様にして転写フィルム１を得た。更に、実施例１と同様の転写方法で転写した。
[Example 5]
A transfer film 1 was obtained in the same manner as in Example 1 except that the thickness of the transfer base film 2 was set to 80 μm in Example 1. Further, the image was transferred by the same transfer method as in Example 1.
[実施例６]
実施例１で、樹脂の配合割合を、ホモＰＰを７０重量％、ＰＰ系エラストマーを３０重量％とした以外は、実施例１と同様にして転写フィルム１を得た。更に、実施例１と同様の転写方法で転写した。
[Example 6]
A transfer film 1 was obtained in the same manner as in Example 1 except that the blending ratio of the resin was 70% by weight of homo-PP and 30% by weight of PP-based elastomer. Further, the image was transferred by the same transfer method as in Example 1.
[実施例７]
実施例１で、樹脂の配合割合を、ホモＰＰを５０重量％、ＰＰ系エラストマーを５０重量％、転写用基材フィルム２の厚さを８０μｍとした以外は、実施例１と同様にして転写フィルム１を得た。更に、実施例１と同様の転写方法で転写した。
[Example 7]
Transferring in the same manner as in Example 1 except that the blending ratio of the resin in Example 1 was 50% by weight of homo PP, 50% by weight of PP elastomer, and the thickness of the transfer base film 2 was 80 μm. Film 1 was obtained. Further, the image was transferred by the same transfer method as in Example 1.
[比較例１]
実施例１で、ホモＰＰをランダムＰＰ（エチレン含有量：４．６ｗｔ％、密度：０．８９０ｇ／ｃｍ３、融点：１３２℃、ＭＩ：３．５ｇ／１０ｍｉｎ）に、樹脂の配合割合を、ランダムＰＰを７０重量％、ＰＰ系エラストマーを３０重量％、転写用基材フィルム２の厚さを６０μｍとした以外は、実施例１と同様にして転写フィルム１を得た。更に、実施例１と同様の転写方法で転写した。
[Comparative Example 1]
In Example 1, homo PP was changed to random PP (ethylene content: 4.6 wt%, density: 0.890 g / cm 3 , melting point: 132 ° C., MI: 3.5 g / 10 min), and the resin mixing ratio was A transfer film 1 was obtained in the same manner as in Example 1 except that 70% by weight of random PP, 30% by weight of PP-based elastomer, and the thickness of the transfer base film 2 were set to 60 μm. Further, the image was transferred by the same transfer method as in Example 1.
[比較例２]
実施例１で、ホモＰＰをランダムＰＰ（エチレン含有量：４．６ｗｔ％、密度：０．８９０ｇ／ｃｍ３、融点：１３２℃、ＭＩ：３．５ｇ／１０ｍｉｎ）に、樹脂の配合割合を、ランダムＰＰを７０重量％、ＰＰ系エラストマーを３０重量％、転写用基材フィルム２の厚さを７０μｍとした以外は、実施例１と同様にして転写フィルム１を得た。更に、実施例１と同様の転写方法で転写した。
[Comparative Example 2]
In Example 1, homo PP was changed to random PP (ethylene content: 4.6 wt%, density: 0.890 g / cm 3 , melting point: 132 ° C., MI: 3.5 g / 10 min), and the resin mixing ratio was A transfer film 1 was obtained in the same manner as in Example 1 except that 70% by weight of random PP, 30% by weight of PP-based elastomer, and the thickness of the base film for transfer 2 were set to 70 μm. Further, the image was transferred by the same transfer method as in Example 1.
[比較例３]
実施例１で、樹脂の配合割合を、ホモＰＰを６０重量％、ＰＰ系エラストマーを４０重量％、転写用基材フィルム２の厚さを６０μｍとした以外は、実施例１と同様にして転写フィルム１を得た。更に、実施例１と同様の転写方法で転写した。
[Comparative Example 3]
Transfer in the same manner as in Example 1 except that the blending ratio of the resin in Example 1 was 60% by weight of homo PP, 40% by weight of PP elastomer, and the thickness of the transfer base film 2 was 60 μm. Film 1 was obtained. Further, the image was transferred by the same transfer method as in Example 1.
[試験方法、評価基準、結果考察]
＜耐熱適性＞
（転写用基材フィルムの融点測定）
ＪＩＳ Ｋ ７１２１が規定する方法に従って、示差走査熱量計（ＴＡ−５０ＷＳ：株式会社島津製作所製）にて測定した。
測定条件；試料仕込み量：６ｍｇ、昇温、降温速度：１０℃／ｍｉｎ
[Test method, evaluation criteria, results consideration]
<Heat resistance>
(Measurement of melting point of substrate film for transfer)
In accordance with the method defined by JIS K 7121, measurement was performed with a differential scanning calorimeter (TA-50WS: manufactured by Shimadzu Corporation).
Measurement conditions: Sample charge: 6 mg, temperature increase, temperature decrease rate: 10 ° C./min
（転写用基材フィルムの耐熱性の評価基準）
真空加圧熱転写法の工程の１４０℃の加熱処理の後に、転写フィルム１として使用可能か否かにより判断した。具体的には、以下の通りとした。
「〇」：真空加圧熱転写法の工程の加熱処理時に転写フィルム１の破れや溶融が起きない。
「×」：真空加圧熱転写法の工程の加熱処理時に転写フィルム１の破れや溶融が起きる。
転写用基材フィルム２に耐熱適性がない場合、上述したような真空加圧熱転写工程でヒータＨの加熱処理条件下、転写フィルム１の破れや溶融により図柄が損なわれると転写自体が不可能となる場合がある。
そのため、転写用基材フィルム２を適正な耐熱適性を備えたものとする必要がある。各実施例の耐熱適性については、転写用基材フィルム２を１４０℃まで加熱した後に、転写用基材フィルム２として使用可能か否かによって判断した。
転写用基材フィルム２の耐熱適性が高いことは、真空加圧熱転写時の加熱処理条件下でもインキ層３の下層が転写時に必要な所望の性質を維持することに繋がることから、転写用基材フィルム２の耐熱適性が高ければ転写適性も良好となりやすい。
表１に示す各実施例・比較例の耐熱適性は、この基準で判断したものである。
(Evaluation criteria for heat resistance of substrate film for transfer)
Judgment was made based on whether or not the film can be used as the transfer film 1 after the heat treatment at 140 ° C. in the vacuum pressure heat transfer process. Specifically, it was as follows.
“◯”: The transfer film 1 is not torn or melted during the heat treatment in the vacuum pressure thermal transfer process.
“X”: The transfer film 1 is torn or melted during the heat treatment in the vacuum pressure thermal transfer process.
If the transfer base film 2 is not heat resistant, the transfer itself is impossible if the pattern is damaged by the tearing or melting of the transfer film 1 under the heat treatment conditions of the heater H in the vacuum-pressurized thermal transfer process as described above. There is a case.
Therefore, it is necessary that the transfer base film 2 has appropriate heat resistance. About the heat resistance aptitude of each Example, after heating the base material film 2 for transfer to 140 degreeC, it was judged by whether it can be used as the base material film 2 for transfer.
The high heat aptitude of the transfer substrate film 2 leads to the fact that the lower layer of the ink layer 3 maintains the desired properties required for transfer even under heat treatment conditions during vacuum pressure thermal transfer. If the heat resistance of the material film 2 is high, the transferability tends to be good.
The heat resistance of each of the examples and comparative examples shown in Table 1 was determined based on this standard.
（耐熱適性の評価結果）
ホモＰＰと耐熱性のあるＰＰ系エラストマーをそれぞれ所定の濃度で含有していることにより、上記真空加圧熱転写時の加熱処理条件（約１４０℃）でも十分に耐えることができた（実施例１〜７参照）。
これに対して、ランダムポリプロピレン（ランダムＰＰ）とＰＰ系エラストマーを用いた場合では、実施例１〜７とは対照的に何れも耐熱適性が得られなかった（比較例１、２）。
(Evaluation results for heat resistance)
By containing the homo-PP and the heat-resistant PP-based elastomer at predetermined concentrations, it was possible to sufficiently withstand the heat treatment conditions (about 140 ° C.) at the time of the vacuum pressure heat transfer (Example 1). ~ 7).
On the other hand, in the case of using random polypropylene (random PP) and a PP-based elastomer, none of the heat resistance suitability was obtained in contrast to Examples 1 to 7 (Comparative Examples 1 and 2).
＜印刷加工適性＞
（降伏点荷重の測定）
ＡＳＴＭ Ｄ ８８２が規定する方法に従って、引張り試験機を用いて、速度５００ｍｍ／ｍｉｎで引張り、測定した。
<Printability>
(Measurement of yield point load)
According to the method specified by ASTM D 882, the tensile tester was used to measure at a speed of 500 mm / min.
（印刷加工適性の評価基準）
印刷加工適性は、転写用基材フィルム２の降伏点荷重により判断した。降伏点荷重が適正な範囲（６．０以上）にあることで、印刷加工する際に転写フィルム１が延び過ぎず、印刷加工適性が高いものとなる。
表１に示す印刷加工適性は、各実施例と比較例について、上記試験方法の条件で行なった測定結果から判断したもので、印刷後に皺が発生しているか否かを基準として判断した。
「○」：転写フィルム１に皺が発生していなかった。
「×」：転写フィルム１に皺が発生していた。
(Evaluation criteria for printing process suitability)
The suitability for printing was determined by the yield point load of the transfer base film 2. When the yield point load is in an appropriate range (6.0 or more), the transfer film 1 does not extend too much during printing, and the printing process suitability is high.
The printing process suitability shown in Table 1 was determined from the measurement results obtained under the conditions of the above-described test method for each example and comparative example, and was determined based on whether or not wrinkles occurred after printing.
“◯”: No wrinkle was generated on the transfer film 1.
“×”: Wrinkles were generated on the transfer film 1.
（印刷加工適性の評価結果）
実施例１〜６に係る転写用基材フィルム２は、ホモＰＰが７０〜５０重量％、ＰＰ系エラストマーが３０〜５０重量％、厚みが７０μｍ以上であることから、降伏点荷重が６．０以上の範囲となって、印刷加工時に伸び過ぎず、印刷加工適性はいずれも良好であった（表１参照）。
このことから、実施例１〜３のようにホモＰＰとＰＰ系エラストマーを所定の割合で含有させることで転写用基材フィルム２を降伏点荷重が６．０以上となる。この結果、降伏点荷重が６．０以上であれば、各種印刷に応じ印刷加工適性が良好な転写用基材フィルム２が得られる。
(Evaluation results of printing process suitability)
Since the transfer base film 2 according to Examples 1 to 6 has a homo PP of 70 to 50% by weight, a PP elastomer of 30 to 50% by weight, and a thickness of 70 μm or more, the yield point load is 6.0. It became the above range, it was not extended too much at the time of a printing process, and all the printing process aptitudes were favorable (refer Table 1).
From this, the yield point load of the transfer base film 2 becomes 6.0 or more by containing the homo-PP and the PP-based elastomer at a predetermined ratio as in Examples 1 to 3. As a result, when the yield point load is 6.0 or more, the transfer base film 2 having good printing process suitability according to various printings can be obtained.
＜転写適性＞
（ヤング率の測定）
ＡＳＴＭ Ｄ ８８２が規定する方法に従って、引張り試験機を用いて、速度５０ｍｍ／ｍｉｎで引張り、応力−歪曲線の引張試験初期の傾きから求めた。
<Transferability>
(Measurement of Young's modulus)
According to the method prescribed by ASTM D882, the tensile tester was used to pull at a speed of 50 mm / min, and the stress-strain curve was obtained from the initial slope of the tensile test.
（転写適性の評価基準）
転写適性は、転写フィルム１のインキ層３を被転写体９への転写する際の転写のしやすさである。転写フィルム１のヤング率が３５０ＭＰａ以下であると、転写時に転写フィルム１が好適に伸びるので３次元転写がしやすいものとなる。３５０ＭＰａより大きくなると、転写時に転写フィルム１の延びが小さく、綺麗に転写することができなくなる。
また、ヤング率の関係（ＭＤ／ＴＤ）が０．９５＜ＭＤ／ＴＤ＜１．０５であれば、転写時に図柄が歪みにくくなるで、綺麗に転写することができる。それ以外の範囲であると、転写時に一方向に図柄が歪む傾向となり、その場合、転写した後の図柄が綺麗ではなくなる。
なお、各実施例・比較例ではインキ層３以外に他の層を設けておらず、また、インキ層３自体は転写フィルム１のヤング率に殆ど関与しないため、転写用基材フィルム２の特性が転写フィルム１の特性とほぼ同様となる。
被転写体９としての樹脂ケース（図６参照）を用いて、以下の評価基準で転写適性を評価した。
「○」：図柄を再現性良く転写できた。
「△」：側面部分の図柄の一部分が少し変形したが、実用上問題なく転写できた。
「×」：側面部分の図柄が変形しており、転写不良であった。
(Evaluation criteria for transfer aptitude)
Transferability is the ease of transfer when the ink layer 3 of the transfer film 1 is transferred to the transfer target 9. When the Young's modulus of the transfer film 1 is 350 MPa or less, the transfer film 1 is suitably stretched during transfer, so that three-dimensional transfer is facilitated. If the pressure is higher than 350 MPa, the transfer film 1 has a small extension during transfer and cannot be transferred clearly.
Further, if the Young's modulus relationship (MD / TD) is 0.95 <MD / TD <1.05, the pattern is less likely to be distorted during transfer, and the image can be clearly transferred. If it is in the other range, the pattern tends to be distorted in one direction at the time of transfer. In this case, the transferred pattern is not beautiful.
In each of the examples and comparative examples, no other layer is provided in addition to the ink layer 3, and the ink layer 3 itself is hardly involved in the Young's modulus of the transfer film 1. However, the characteristics of the transfer film 1 are almost the same.
Using a resin case (see FIG. 6) as the transfer target 9, transfer suitability was evaluated according to the following evaluation criteria.
“◯”: The pattern was transferred with good reproducibility.
“Δ”: A part of the pattern on the side part was slightly deformed, but could be transferred without any practical problem.
“×”: The pattern on the side surface was deformed, and transfer was defective.
（転写適性の評価結果）
また、実施例では、図７（ａ）に示すように、転写フィルム１が角部の曲面でも均一に伸びて木目模様の巾が等間隔となる傾向である一方で、比較例では、図７（ｂ）に示すように、木目模様が部分的に集中して、横断方向で木目模様が等間隔とならない傾向となった。
なお、比較例１と比較例３は、ヤング率が３５０ＭＰａ以下であるが、０．９５＜ＭＤ／ＴＤ＜１．０５の範囲から外れていることから、転写時に奇麗に図柄が転写しないために転写適性が「×」となった。
(Evaluation result of transfer aptitude)
Further, in the example, as shown in FIG. 7A, the transfer film 1 tends to uniformly extend even on the curved surface of the corner portion, and the width of the grain pattern tends to be equally spaced. As shown in (b), the grain pattern was partially concentrated, and the grain pattern tended not to be equally spaced in the transverse direction.
In Comparative Example 1 and Comparative Example 3, the Young's modulus is 350 MPa or less, but it is out of the range of 0.95 <MD / TD <1.05. The transfer aptitude was “x”.
(総合評価)
総合評価としては、上記各適性の評価から総合判断して実施例１〜３の転写用基材フィルム２が特に好ましい性質を備えたものとなった。
(Comprehensive evaluation)
As a comprehensive evaluation, the transfer base film 2 of Examples 1 to 3 was provided with particularly preferable properties based on a comprehensive judgment based on the evaluations of the respective aptitudes.
以上、本発明に係る転写用基材フィルム２等を実施の形態や各例に基づき説明してきたが、具体的な構成については、これらに限定されるものではなく、特許請求の範囲の各請求項に係る発明の要旨を逸脱しない限り、設計の変更や追加等は許容される。 As described above, the transfer base film 2 and the like according to the present invention have been described based on the embodiment and each example, but the specific configuration is not limited thereto, and each claim in the claims Design changes and additions are permitted without departing from the spirit of the invention according to the paragraph.
特に、上記融点、ヤング率、降伏点荷重の範囲を満たす樹脂構成、比率等の転写フィルム１であれば、上述したホモＰＰと、ＰＰ系エラストマーに限らず、本発明に係る転写フィルム１としての転写時の作用・効果が得られる可能性が高い。 In particular, as long as the transfer film 1 has a resin structure and ratio that satisfy the ranges of the melting point, Young's modulus, and yield point load, the transfer film 1 according to the present invention is not limited to the above-mentioned homo PP and PP elastomers. There is a high possibility of obtaining the action and effect during transfer.
１ 転写フィルム
２ 転写用基材フィルム
３ インキ層
４ 電磁バルブ
５ 成形体
６ 上チャンバー
７ 下チャンバー
８Ａ，８Ｂ 駆動装置
９ 被転写体
１０ 支持台
１１ 圧縮ガスボンベ
１２ 真空ポンプ
１３ 金属ローラ
１４ シリコンローラ
１５ ドクターブレード
１６ シリンダ
１７ 乾燥機
１８ インキ溜め
１９ 圧着ローラ
Ｈ ヒータ
DESCRIPTION OF SYMBOLS 1 Transfer film 2 Transfer base film 3 Ink layer 4 Electromagnetic valve 5 Molded body 6 Upper chamber 7 Lower chamber 8A, 8B Driving device 9 Transfer target 10 Support base 11 Compressed gas cylinder 12 Vacuum pump 13 Metal roller 14 Silicon roller 15 Doctor Blade 16 Cylinder 17 Dryer 18 Ink reservoir 19 Pressure roller H Heater
Claims (4)
下記（ａ）〜（ｃ）を満たし、前記転写用基材フィルムのインキ層が印刷される前記一方の面に中心線平均粗さＲａ（ＪＩＳ Ｂ ０６０１）で０.１〜５μmの凹凸構造が形成されていることを特徴とする転写用基材フィルム。
（ａ）融点が１６１℃以上
（ｂ）ヤング率が３５０ＭＰａ以下
（ｃ）フィルムのＭＤ方向のヤング率とＴＤ方向のヤング率の関係（ＭＤ／ＴＤ）が０．９５＜ＭＤ／ＴＤ＜１．０５ In the base film for transfer in which the ink layer transferred to the transfer target is printed on one side,
Following (a) ~ (c) meets the transfer base material center line average roughness wherein the one surface of the ink layer is printed in the film Ra (JIS B 0601) in 0.1~5μm relief structure A substrate film for transfer, characterized in that is formed .
(A) Melting point is 161 ° C. or higher (b) Young's modulus is 350 MPa or less (c) The relationship between MD Young's modulus in MD direction and Young's modulus in TD direction (MD / TD) is 0.95 <MD / TD <1. 05
３０〜５０重量％の、融点が１４０〜１７０℃のプロピレン系エラストマーとからなることを特徴とする請求項１又は請求項２に記載の転写用基材フィルム。 70-50% by weight homopolypropylene,
The substrate film for transfer according to claim 1 or 2, comprising 30 to 50% by weight of a propylene-based elastomer having a melting point of 140 to 170 ° C.
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| JP6705535B1 (en) * | 2018-12-07 | 2020-06-03 | 住友ベークライト株式会社 | Film set for attaching functional layers and insulating film |
| JP6705541B1 (en) * | 2018-12-07 | 2020-06-03 | 住友ベークライト株式会社 | Film set for attaching functional layers and insulating film |
| JP7524549B2 (en) | 2019-06-20 | 2024-07-30 | 住友ベークライト株式会社 | Base film for automotive painting |
| KR102169467B1 (en) * | 2020-01-30 | 2020-10-23 | 에스케이씨하이테크앤마케팅(주) | Highly stretchable film and preparation method thereof |
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| JPH09142092A (en) * | 1995-11-27 | 1997-06-03 | Bando Chem Ind Ltd | Transfer film with grain pattern and grain tone decorative material |
| JPH09226297A (en) * | 1996-02-22 | 1997-09-02 | Idemitsu Petrochem Co Ltd | Transfer film sheet |
| JPH1060128A (en) * | 1996-08-13 | 1998-03-03 | Nissha Printing Co Ltd | Film and decorative sheet |
| JPH1060127A (en) * | 1996-08-13 | 1998-03-03 | Nissha Printing Co Ltd | Film and decorative sheet |
| JP2000000944A (en) * | 1998-06-16 | 2000-01-07 | Dainippon Printing Co Ltd | Transfer sheet and curved surface transferring method using the same |
| JP2000127693A (en) * | 1998-10-28 | 2000-05-09 | Tokuyama Corp | Transfer film |
| JP2001113642A (en) * | 1999-10-21 | 2001-04-24 | Toppan Printing Co Ltd | Decorative sheet, transfer sheet and decoration method using them |
| JP2002200716A (en) * | 2000-12-28 | 2002-07-16 | Tokuyama Corp | Polyolefin multilayer film |
| JP5438256B2 (en) * | 2006-11-17 | 2014-03-12 | 三井化学株式会社 | Polypropylene resin film and use thereof |
| JP5960427B2 (en) * | 2011-12-19 | 2016-08-02 | 大倉工業株式会社 | Method for producing substrate film for transfer |
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