JP4239048B2 - Surface treatment film for chip carrier - Google Patents

Surface treatment film for chip carrier Download PDF

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Publication number
JP4239048B2
JP4239048B2 JP01050899A JP1050899A JP4239048B2 JP 4239048 B2 JP4239048 B2 JP 4239048B2 JP 01050899 A JP01050899 A JP 01050899A JP 1050899 A JP1050899 A JP 1050899A JP 4239048 B2 JP4239048 B2 JP 4239048B2
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Prior art keywords
film
treated
surface treatment
layer
static friction
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JP2000212301A (en
Inventor
淳 星尾
倫明 荻野
浩三 前田
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Toyobo Co Ltd
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Toyobo Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、表面処理フイルムに関し、より詳しくは常温での滑り性と低温での滑り性が異なる表面処理フイルムに関する。
【0002】
【従来の技術】
プラスチックフイルムを小幅にマイクロスリットし、パンケーキ状態で輸送する場合、例えば、チップキャリヤーや、磁気テープ等、巾が5〜20mm程度のフイルムを数千mのパンケーキ状態にし、空輸、船積み等で、輸送する場合、高温から低温まで種々の環境温度になる場合がある。特にプラスチックフイルムは低温になるにつれ体積収縮するので、常温時に巻崩れないよう硬く巻いても、低温下で保管されると、パンケーキにす抜け現象(隙間があく現象)発生し、巻崩れが起きやすくなる。一度巻崩れが発生すると、元の状態にはもどらない為、その商品は使用出来なくなる。
かかる不具合を排除するために、フイルムに滑り性を与える処理をすることが考えられる。滑り性を良くすると、常温ではフイルムは均一に巻けるが、逆に巻崩れに対しては、弱くなる。又、滑り性を悪くすると、巻崩れに対しては強くなるが、逆に常温でフイルムを均一に巻けなくなるので、低温に保管したときのす抜け現象は大きくなり、巻崩れが起こりやすくなる。
【0003】
【発明が解決しようとする課題】
本発明は、上記欠点を解決しようとするものであり、その目的は小幅フイルムをパンケーキ状態に巻いたときに、環境温度の変化により巻崩れの発生しにくい表面処理フイルムを提供することにある。
【0004】
【課題を解決するための手段】
本発明者らは、表面処理フイルムについて、前記課題を解決するため鋭意検討した結果、遂に本発明を完成するに至った。即ち、本発明は、基材フイルムである2軸延伸ポリエチレンテレフタレートフイルムと、該基材フイルムの少なくとも片面に形成された表面処理層とを含有する表面処理フイルムであって、前記表面処理層がラウリル酸モノグリセライドを含有し、前記表面処理層の付着量が0.1g/m2以下であり、前記表面処理層の20℃での静摩擦係数μaと前記表面処理層の−10℃での静摩擦係数μbとの比(μa/μb)が1未満であることを特徴とするチップキャリア用表面処理フイルムである。好ましい実施態様は、表面処理層の20℃での静摩擦係数μaが0.6以下である表面処理フイルムである。また前記熱可塑性樹脂フィルムが、シーラント層をラミネートした複合フイルムであることを特徴とする表面処理フイルムである。さらに、前記表面処理フイルムの巾が5〜20mmであることを特徴とする表面処理フイルム。
【0005】
【発明の実施の形態】
以下に本発明を詳細に説明する。本発明の表面処理フイルムは、基材フイルムと、この基材フイルムの少なくとも片面に形成された表面処理層とを含有する。基材フイルムは力学的性質、耐熱性、透明性に優れたポリエステル、ポリアミドが好ましく、特に、優れた機械的強度の点で2軸延伸されたポリエチレンテレフタレートを用いる。また基材フイルムは、シーラント層としてのポリエチレン、エチレン酢ビ等をラミネートした複合フイルムであっても良い。該ポリエチレンテレフタレート基材フイルムの厚みは、好ましくは5〜250μm、より好ましくは9〜50μmである。
【0006】
表面処理層は、脂肪酸系組成物を含有する組成物からなる。表面処理層に脂肪酸系組成物を含有させることにより、環境温度の変化によるパンケーキの巻崩れを低減することが可能となる。
【0007】
脂肪酸系組成物としては、例えば、高級脂肪酸系エステル、脂肪酸系エーテル、脂肪酸系アミド、等が挙げられる。
【0008】
上記脂肪酸系組成物の分子量は5000以下であることが好ましく、特に好ましくは200〜1000である。分子量が5000を超えると、通常高分子タイプと呼ばれる物の場合には、常温のみならず低温での滑りも良くなり、低温時での巻崩れが起こりやすくなる。前記脂肪酸系組成物としては、ラウリル酸モノグリセライドを用いる。

【0009】
前記脂肪酸系組成物の付着量は、0.1g/m2以下が好ましい。特に0.05g/m2以下が好ましい。付着量が0.1g/m2を超えると、常温のみならず低温での滑りも良くなり、低温時での、巻崩れが起こりやすくなる。
【0010】
基材フイルムへの帯電防止性能を付与させるため、前記組成中に公知の帯電防止剤、たとえばアニオン系帯電防止剤、カチオン系帯電防止剤、ノニオン系帯電防止剤、両性帯電防止剤等を含有させても良い。又基材フイルムへの易接着性能を付与させるため、前記組成中に公知のエステル樹脂、ウレタン樹脂、アクリル樹脂等を含有させても良い。以上の帯電防止剤、あるいは樹脂を含有しても、表面処理層の滑り機能は発揮される。又あらかじめ基材フイルムに帯電防止性能、あるいは易接着性能を持たせ、その上に、前記組成を構成させても良い。
【0011】
表面処理層の形成方法は特に限定されないが、表面処理層用塗布液を調整し、これを基材フイルム上に塗布、乾燥、熱処理する方法が好ましい。まず、表面処理剤、必要に応じて前記樹脂等を溶媒に加え、溶液または分散液として塗布液を調整する。溶媒は、水、有機溶剤どちらでも良いが、特にコート性を考慮するとアルコール系が好ましい。
【0012】
前記の塗布液を基材フイルム上に塗布する。塗布方法は特に限定はないが、グラビアやリバースなどのロールコーテイング法、ドクターナイフ法やエアーナイフ、ノズルコーテイング法などの通常の方法を用いることができる。また、スプレー法で塗布する方法を用いても良い。塗布は、延伸後の基材フイルム表面に行っても良いし、延伸前の基材フイルム表面に行っても良い。また、得られる表面処理フイルムが二軸延伸フィルムである場合、一軸延伸後の基材フイルム表面に塗布後、延伸処理を行っても良い。
【0013】
本発明の表面処理フイルムは、常温では巻き取り性が良く、低温では巻崩れにくいフイルムであるので、チップキャリヤーフイルム有用である。
【0014】
【実施例】
次に本発明の実施例及び比較例を示す。本発明に用いる評価法を以下に示す。
<静摩擦係数の評価>
恒温室内で、ASTM D―1894に準拠し、表面処理フイルムの処理面と非処理面との静摩擦係数を測定する。
20℃での静摩擦係数…μa
−10℃での静摩擦係数…μb
とし、μa/μbを求めた。
【0015】
<パンケーキの巻崩れ性の評価>
表面処理フイルムを、5mm巾スリットし、500mのロール(パンケーキ)を作成する。恒温室内(20℃または−10℃)でパンケーキを24時間エージングする。エージング後パンケーキの巻崩れ力を、恒温室内で以下の方法により測定する。
パンケーキを、内径150mm肉厚10mmの筒の上に置く。パンケーキの上中心部に、半径50mmの鉄製の円盤を置く。オートグラフ(島津製作所製)のロードセルで、円盤を垂直に押す。50mm/minのスピードで、ロードセルを押していき、パンケーキがすっぽ抜けた時の荷重を測定した。すっぽ抜けた時の荷重が、1kg以上を良好とした。
【0016】
実施例1
ラウリル酸モノグリセライド0.05重量部、メタノール99.95重量部を混合し、30℃に温調して、溶解する。これを常法により得られた2軸延伸ポリエチレンテレフタレートフイルム(厚み25μm)上にワイヤーバーNo.5で、乾燥後の厚さが0.004g/m2となるように塗布し、80℃で30秒間熱風乾燥機に入れて乾燥させて表面処理フイルムを得た。
【0017】
実施例2
実施例1において、2軸延伸ポリエチレンテレフタレートの代わりに常法にして得られた2軸延伸ポリエチレンテレフタレートフイルム(厚み25μm)にLDPE(低密度ポリエチレン:厚み25μm)を、285℃で押し出しラミしたフイルムを用いたこと以外は、実施例1と同様にして表面処理フイルムを得た。
【0018】
比較例1
実施例1において、ラウリル酸モノグリセライドの代わりに、ポリエチレンワックス(ハイテックE6000、東邦化学工業製)を用い、溶媒として、メタノールの代わりに水/メタノール混合液(重量比:30/70)を用いたこと以外は、実施例1と同様にして表面処理フイルムを得た。
【0019】
比較例2
実施例1において、ラウリル酸モノグリセライドを用いなかったこと以外は、実施例1と同様にして表面処理フイルムを得た。
【0020】
比較例3
実施例2において、ラウリル酸モノグリセライドを用いなかったこと以外は、実施例2と同様にして表面処理フイルムを得た。
【0021】
実施例1、2および比較例1〜3で得られた表面処理フイルムについて評価を行った。その結果を表1に示す。
【0022】
【表1】

Figure 0004239048
【0023】
表1に示すように、実施例1及び2で得られた表面処理フイルムにおいては、静摩擦係数比(μa/μb)が1未満であり、かつパンケーキの巻崩れ性も良好であった。これに対し、比較例1〜3で得られた表面処理フイルムにおいては、静摩擦係数比(μa/μb)が1以上であり、かつパンケーキの巻崩れ性は劣っていた。
【0024】
【発明の効果】
以上の説明で明らかなように、本発明においては、常温での巻き取り性に優れ、低温での巻崩れ性に良好な、表面処理フイルムを提供することができる。従って、このような表面処理フイルムは、チップキャリヤーフイルム有用である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a surface-treated film, and more particularly to a surface-treated film having different slip properties at normal temperature and slip properties at low temperature.
[0002]
[Prior art]
When a plastic film is micro-slit into a small width and transported in a pancake state, for example, a chip carrier or a magnetic tape or the like, a film having a width of about 5 to 20 mm is made into a pancake state of several thousand meters, and is used for air transportation, shipping, etc. When transporting, there may be various environmental temperatures from high temperature to low temperature. In particular, plastic film shrinks in volume as it cools, so even if it is wound tightly so that it does not collapse at room temperature, if it is stored at a low temperature, a pancake breakthrough phenomenon (a phenomenon in which a gap occurs) will occur, causing the film to collapse. It becomes easy to get up. Once the roll-off occurs, the product cannot be used because it does not return to its original state.
In order to eliminate such inconvenience, it is conceivable to perform a process for giving slipperiness to the film. If the slipperiness is improved, the film can be wound evenly at room temperature, but on the other hand, it is weak against the collapse. In addition, if the slipperiness is deteriorated, the film becomes strong against the collapse, but conversely, the film cannot be uniformly wound at room temperature. Therefore, the slipping phenomenon when stored at a low temperature becomes large, and the collapse tends to occur.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide a surface-treated film that is less likely to collapse due to a change in environmental temperature when a narrow film is wound into a pancake state. .
[0004]
[Means for Solving the Problems]
As a result of intensive studies on the surface-treated film to solve the above problems, the present inventors have finally completed the present invention. That is, the present invention is a surface treatment film comprising a biaxially stretched polyethylene terephthalate film as a base film and a surface treatment layer formed on at least one side of the base film, wherein the surface treatment layer is lauryl. Acid monoglyceride is contained, the adhesion amount of the surface treatment layer is 0.1 g / m 2 or less, the static friction coefficient μa of the surface treatment layer at 20 ° C. and the static friction coefficient μb of the surface treatment layer at −10 ° C. The surface treatment film for chip carrier , characterized in that the ratio (μa / μb) to is less than 1. A preferred embodiment is a surface-treated film in which the surface-treated layer has a static friction coefficient μa at 20 ° C. of 0.6 or less. Further, the thermoplastic resin film is a surface treatment film which is a composite film obtained by laminating a sealant layer. Further, the surface treatment film is characterized in that the width of the surface treatment film is 5 to 20 mm.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is described in detail below. The surface-treated film of the present invention contains a substrate film and a surface-treated layer formed on at least one surface of the substrate film. Substrate film is, mechanical properties, heat resistance, polyester, polyamide is preferably excellent in transparency, in particular, using a polyethylene terephthalate which has been biaxially stretched in view of excellent mechanical strength. The base film may be a composite film in which polyethylene, ethylene acetate, or the like as a sealant layer is laminated. The thickness of the polyethylene terephthalate base film is preferably 5 to 250 μm, more preferably 9 to 50 μm.
[0006]
The surface treatment layer is composed of a composition containing a fatty acid composition. By including the fatty acid composition in the surface treatment layer, it is possible to reduce the collapse of the pancake due to a change in the environmental temperature.
[0007]
Examples of the fatty acid composition include higher fatty acid esters, fatty acid ethers, fatty acid amides, and the like.
[0008]
The molecular weight of the fatty acid composition is preferably 5000 or less, particularly preferably 200 to 1000. When the molecular weight exceeds 5,000, in the case of what is usually called a polymer type, slipping at not only normal temperature but also low temperature is improved, and collapse at low temperature is likely to occur. As the fatty acid composition , lauric acid monoglyceride is used.

[0009]
The adhesion amount of the fatty acid composition is preferably 0.1 g / m 2 or less. In particular, 0.05 g / m 2 or less is preferable. When the adhesion amount exceeds 0.1 g / m 2 , sliding at low temperature as well as normal temperature is improved, and roll-up is likely to occur at low temperature.
[0010]
In order to impart antistatic performance to the base film, a known antistatic agent such as an anionic antistatic agent, a cationic antistatic agent, a nonionic antistatic agent, an amphoteric antistatic agent, etc. is included in the composition. May be. Moreover, in order to give the easy-adhesion performance to a base film, you may contain well-known ester resin, urethane resin, an acrylic resin, etc. in the said composition. Even when the above antistatic agent or resin is contained, the slip function of the surface treatment layer is exhibited. In addition, the base film may be previously provided with antistatic performance or easy adhesion performance, and the composition may be formed thereon.
[0011]
The method for forming the surface treatment layer is not particularly limited, but a method of preparing a surface treatment layer coating solution and coating, drying, and heat treating the coating solution on the substrate film is preferable. First, a surface treatment agent and, if necessary, the resin or the like are added to a solvent to prepare a coating solution as a solution or dispersion. The solvent may be either water or an organic solvent, but an alcohol type is preferred particularly considering the coatability.
[0012]
The coating solution is applied onto the substrate film. The coating method is not particularly limited, and usual methods such as a roll coating method such as gravure and reverse, a doctor knife method, an air knife, and a nozzle coating method can be used. Moreover, you may use the method of apply | coating with a spray method. The application may be performed on the surface of the base film after stretching, or may be performed on the surface of the base film before stretching. Moreover, when the obtained surface treatment film is a biaxially stretched film, you may perform a extending | stretching process after apply | coating to the base-material film surface after uniaxial stretching.
[0013]
The surface-treated film of the present invention is useful as a chip carrier film because it is a film that has good windability at room temperature and is difficult to roll at low temperatures.
[0014]
【Example】
Next, examples and comparative examples of the present invention will be shown. Evaluation methods used in the present invention are shown below.
<Evaluation of static friction coefficient>
In a temperature-controlled room, in accordance with ASTM D-1894, measure the coefficient of static friction between the treated and non-treated surfaces of the surface-treated film.
Coefficient of static friction at 20 ℃… μa
Coefficient of static friction at -10 ℃… μb
And μa / μb was determined.
[0015]
<Evaluation of rollability of pancake>
The surface-treated film is slit 5 mm wide to create a 500 m roll (pancake). The pancake is aged for 24 hours in a constant temperature room (20 ° C or -10 ° C). After aging, the roll-off force of the pancake is measured by the following method in a constant temperature room.
The pancake is placed on a cylinder having an inner diameter of 150 mm and a wall thickness of 10 mm. An iron disk with a radius of 50 mm is placed in the center of the pancake. Push the disk vertically with the load cell of Autograph (manufactured by Shimadzu Corporation). The load cell was pushed at a speed of 50 mm / min, and the load when the pancake was completely removed was measured. The load at the time of slipping off was determined to be 1 kg or more.
[0016]
Example 1
0.05 parts by weight of lauric acid monoglyceride and 99.95 parts by weight of methanol are mixed, adjusted to a temperature of 30 ° C. and dissolved. This was coated on a biaxially stretched polyethylene terephthalate film (thickness 25 μm) obtained by a conventional method with a wire bar No. 5 so that the thickness after drying was 0.004 g / m 2, and 30 ° C. at 30 ° C. It was put into a hot air dryer for 2 seconds and dried to obtain a surface-treated film.
[0017]
Example 2
In Example 1, instead of biaxially stretched polyethylene terephthalate, a biaxially stretched polyethylene terephthalate film (thickness 25 μm) obtained by a conventional method was extruded with LDPE (low density polyethylene: thickness 25 μm) at 285 ° C. and laminated. A surface-treated film was obtained in the same manner as in Example 1 except that it was used.
[0018]
Comparative Example 1
In Example 1, polyethylene wax (Hitech E6000, manufactured by Toho Chemical Industry) was used instead of lauric acid monoglyceride, and a water / methanol mixture (weight ratio: 30/70) was used instead of methanol as a solvent. Except for this, a surface-treated film was obtained in the same manner as in Example 1.
[0019]
Comparative Example 2
In Example 1, a surface-treated film was obtained in the same manner as in Example 1 except that lauric acid monoglyceride was not used.
[0020]
Comparative Example 3
In Example 2, a surface-treated film was obtained in the same manner as in Example 2 except that lauric acid monoglyceride was not used.
[0021]
The surface-treated films obtained in Examples 1 and 2 and Comparative Examples 1 to 3 were evaluated. The results are shown in Table 1.
[0022]
[Table 1]
Figure 0004239048
[0023]
As shown in Table 1, in the surface-treated films obtained in Examples 1 and 2, the static friction coefficient ratio (μa / μb) was less than 1, and the rollability of the pancake was good. On the other hand, in the surface-treated films obtained in Comparative Examples 1 to 3, the static friction coefficient ratio (μa / μb) was 1 or more, and the rollability of the pancake was inferior.
[0024]
【The invention's effect】
As is apparent from the above description, the present invention can provide a surface-treated film that is excellent in winding property at room temperature and good in unwinding property at low temperature. Therefore, such a surface treatment film is useful in a chip carrier film.

Claims (4)

基材フイルムである2軸延伸ポリエチレンテレフタレートフイルムと、該基材フイルムの少なくとも片面に形成された表面処理層とを含有する表面処理フイルムであって、前記表面処理層がラウリル酸モノグリセライドを含有し、前記表面処理層の付着量が0.1g/m2以下であり、前記表面処理層の20℃での静摩擦係数μaと前記表面処理層の−10℃での静摩擦係数μbとの比(μa/μb)が1未満であることを特徴とするチップキャリア用表面処理フイルム。A surface-treated film comprising a biaxially stretched polyethylene terephthalate film as a base film and a surface-treated layer formed on at least one side of the base film, wherein the surface-treated layer contains lauric acid monoglyceride , The adhesion amount of the surface treatment layer is 0.1 g / m 2 or less, and the ratio of the static friction coefficient μa of the surface treatment layer at 20 ° C. to the static friction coefficient μb of the surface treatment layer at −10 ° C. (μa / A surface treatment film for a chip carrier , wherein μb) is less than 1. 表面処理層の20℃での静摩擦係数μaが0.6以下であることを特徴とする請求項1記載の表面処理フイルム。  2. The surface-treated film according to claim 1, wherein the surface-treated layer has a static friction coefficient [mu] a at 20 [deg.] C. of 0.6 or less. 前記熱可塑性樹脂フイルムが、シーラント層をラミネートした複合フイルムであることを特徴とする請求項1または2に記載の表面処理フイルム。The surface-treated film according to claim 1 or 2 , wherein the thermoplastic resin film is a composite film in which a sealant layer is laminated. 前記表面処理フイルムの巾が5〜20mmであることを特徴とする請求項1〜のいずれかに記載の表面処理フイルム。The surface-treated film according to any one of claims 1 to 3 , wherein a width of the surface-treated film is 5 to 20 mm.
JP01050899A 1999-01-19 1999-01-19 Surface treatment film for chip carrier Expired - Fee Related JP4239048B2 (en)

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