JP2010257983A - 異方導電フィルム巻重体 - Google Patents
異方導電フィルム巻重体 Download PDFInfo
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Abstract
【解決手段】支持体と、異方導電性接着剤層とを積層した異方導電フィルムであって、支持体の幅方向両端部に異方導電性接着剤層の形成されていない領域があり、異方導電性接着剤層の幅が、0.5mm〜5mmであり、リール側板を有する芯材に同心円状に重ね合わせてある異方導電フィルム巻重体。
【選択図】図1
Description
また、ACFの狭幅製品(例えば、幅0.8mm以下)においては、リールの巻き崩れ、支持体の強度不足による伸び、切れ等によって、生産性が低下する問題があった。さらに、狭幅製品の場合、ACFの幅と厚みが近い値となるので、認識性が悪いという問題があった。
一方、本発明においては、支持体の幅を異方導電性接着剤層の幅よりも広くしてある。このように、支持体の幅方向端部に異方導電性接着剤層を形成していない領域を設けることにより、接着剤成分が支持体の幅を超えて幅方向端部から染み出すことを抑制できる。従って、異方導電フィルムの使用時のブロッキングを低減できる。
このように、支持体を第一の支持体層と第二の支持体層の積層構造とすることにより、上述した異方導電フィルムの、従来の製造方法を活用して、支持体の幅を異方導電性接着剤層の幅よりも広くした異方導電フィルムを得ることができる。
また、支持体を積層構造とすることによって、支持体の強度を向上することができるので、特に、狭幅製品の場合における支持体の強度不足による伸び、切れを防止できる。
例えば、被接続対象の額縁部が狭い場合等、異方導電性接着剤14を支持体のどちらか一端側に寄せて形成することにより、異方導電フィルムのハンドリング性を向上できる。
このように、一般に行なわれている異方導電フィルムの製造方法(原反から一定幅の積層体を裁断する工程と再巻取り工程)を有効に活用することによって、新たな設備投資を抑制することができる。
[第一実施形態]
図1は、本発明の第一実施形態である異方導電フィルムを示す図であり、(a)は、異方導電フィルムの外観斜視図、(b)は異方導電フィルムの幅方向断面図である。
本実施形態の異方導電フィルム10は、リール側板11を有する芯材12に同心円状に重ね合わせて巻重体を形成しており、支持体13及び異方導電性接着剤層14を積層した構成を有する。支持体13の幅方向両端部には、異方導電性接着剤層14を形成していない未形成領域14’が形成されている。
本実施形態では、未形成領域14’を設けることにより、接着剤成分が流動しても未形成領域14’に留まるため、支持体13の幅を超えて幅方向端部から染み出すことを抑制できる。これにより、接着剤成分の染み出しに起因する異方導電フィルム10の繰り出し時のブロッキングの発生を抑制できる。
図2は、本発明の第二実施形態である異方導電フィルムの幅方向断面図である。
本実施形態の異方導電フィルム20では、支持体13が、第一の支持体層13−1と、これよりも幅広な第二の支持体層13−2とを積層した構造を有する他は、上述した第一実施形態と同じである。
このように、支持体13を第一の支持体層13−1と第二の支持体層13−2の積層構造とすることにより、異方導電フィルムの一般的な製造方法を活用して、支持体13の幅を異方導電性接着剤層14の幅よりも広くした異方導電フィルム20を得ることができる。
尚、第一の支持体層13−1と第二の支持体層13−2とを接着する方法としては、第一の支持体層13−1と第二の支持体層13−2の間に接着層15を形成する方法がある。
支持体の厚さは、特に限定はないが、4μm〜200μmが好ましい。また、支持体の幅は、異方導電性接着剤層の幅よりも広く設定すればよく、例えば、500μm〜30mmが好ましい。
異方導電性接着層の厚さは、特に限定はなく、使用する接着剤及び被着対象に合わせて適宜選択するが、5μm〜100μmが好ましい。また、異方導電性接着層の幅は、使用用途に合わせて調整すればよいが、一般には0.5mm〜5mm程度である。
第一の支持体層と第二の支持体層の厚さは、特に限定はないが、二層の合計厚さが20μm〜300μmとなることが好ましい。
図4は、本発明の異方導電フィルムの製造方法を示す概略図である。
本発明の製造方法は、第一の支持体層13−1と異方導電性接着剤層14とを積層した第一積層体31と、第二の支持体層13−2と、第一の支持体層と第二の支持体層とを接着する接着剤層15とを積層した構造を有し、第一積層体31の幅よりも幅広である第二積層体32とを、第一の支持体層13−1と接着剤層15が接するように積層し、第一の支持体層13−1と第二の支持体層13−2とを接着する工程を有する。
第一の支持体層13−1と第二の支持体層13−2とを接着する方法として、例えば、第一積層体31及び第二積層体32を、同一の芯材に巻付けることにより生じる、巻付け時の圧力を利用して接着する方法が挙げられる。巻付け時の圧力は、第一積層体31及び第二積層体32にかけるテンション(張力)、即ち、第一積層体31及び第二積層体32の繰り出し速度と芯材への巻き取り速度を制御することによって調整できる。
Claims (4)
- 支持体と、異方導電性接着剤層とを積層した異方導電フィルムであって、前記支持体の幅方向両端部に前記異方導電性接着剤層の形成されていない領域があり、
前記異方導電性接着剤層の幅が、0.5mm〜5mmであり、
リール側板を有する芯材に同心円状に重ね合わせてある異方導電フィルム巻重体。 - 前記異方導電性接着剤層の幅が、0.8mm以下である請求項1に記載の異方導電フィルム巻重体。
- 前記支持体の幅方向の両端部にある前記異方導電性接着剤層の形成されていない領域の幅が、それぞれ異なる請求項1又は2に記載の異方導電フィルム巻重体。
- 前記異方導電フィルムが、相対する電極同士の導通状態を保ち、
隣接する電極同士の絶縁を保つように電気的接続と機械的固着を行う接続材料として使用される請求項1〜3のいずれかに記載の異方導電フィルム巻重体。
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KR20100117680A (ko) | 2010-11-03 |
KR101025369B1 (ko) | 2011-03-28 |
JP4650490B2 (ja) | 2011-03-16 |
KR20080026160A (ko) | 2008-03-24 |
WO2007015372A1 (ja) | 2007-02-08 |
JPWO2007015372A1 (ja) | 2009-02-19 |
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CN101233655B (zh) | 2010-08-18 |
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