JP6535989B2 - 異方導電性フィルムの製造方法及び接続構造体 - Google Patents
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Description
この場合、塗工ロール周面部のパターンを隙間なく彫刻することができ、導電粒子を離型フィルム上に均一に分散配列することができる。
この範囲を満たすことにより、塗工ロールに樹脂溶液を供給するときは、塗工ロール周面部の彫刻の溝に導電粒子が効率良く入り、更に、離型フィルムに樹脂溶液を塗布するときは、導電粒子を効率よく離型フィルムに転写することができる。
密閉チャンバーを備えることにより、樹脂溶液中の溶剤揮発を抑制し、異方導電性フィルムを長尺塗工する場合であっても、一定のフィルム厚で塗工することが可能である。さらに、密閉チャンバーに形成された樹脂溶液溜まり内に樹脂溶液を循環供給する樹脂溶液供給手段を備えることにより、塗工溶液中の導電粒子が沈降することを防止できる。
この様な層構成にすることで、異方導電性フィルムの接着性、実装時における流動性、対向回路間に捕捉される導電粒子の捕捉性を制御することができる。
[塗工装置]
[異方導電性フィルムの構成]
[異方導電性フィルムの製造方法]
剥離フィルム12の搬送経路上には、導電性接着剤層13の形成材料となる樹脂溶液を塗布する塗工ロール53が配置されており、塗工ロール53によって導電粒子Pが分散された樹脂溶液が剥離フィルム12上に塗布される。この時、塗工ロール53上のセル層68に彫刻されたセルパターン69の模様に導電粒子Pが配列される。
[接続構造体の製造方法]
(実施例1)
(実施例2)
(実施例3)
(比較例1)
間隔が5μm、深さが3μmの直線状の彫刻を有する塗工ロールを用いた以外は、実施例1と同様にし、比較例1に係る異方導電性フィルムを作製した。
(異方導電性フィルム中の導電粒子の密度算出)
(導電粒子の単分散率の評価)
(接続構造体の作製)
(導電粒子の捕捉率及び抵抗特性の評価)
Claims (4)
- 導電粒子及び接着剤成分を含んで構成される異方導電性フィルムの製造方法であって、
前記異方導電性フィルムは、塗工ロールの表面に導電粒子及び接着剤成分を有機溶剤に溶解した異方導電性フィルム樹脂溶液を供給し、余分な異方導電性フィルム樹脂溶液を掻き取った後に、塗工ロールの表面の異方導電性フィルム樹脂溶液を離型フィルム上に塗布する塗布装置を用いることを特徴とし、
前記塗工ロール周面部は、規則的に配列された多角形型の凹凸状の彫刻加工を有しており、
前記彫刻の溝から離型フィルム上に、接着剤成分を塗布すると同時に、導電粒子を転写し配列させる工程を有し、
前記塗布装置には、前記塗工ロールに異方導電性フィルム樹脂溶液を塗布する密閉チャンバーを有する塗工ユニットと、密閉チャンバーに形成された樹脂溶液溜まり内に、異方導電性フィルム樹脂溶液を循環供給する樹脂溶液供給手段と、を備えることを特徴とする異方導電性フィルムの製造方法。 - 前記多角形型の凹凸状の彫刻加工が、正三角形,正方形,正五各形,又は、正六角形状であることを特徴とする請求項1記載の異方導電性フィルムの製造方法。
- 前記多角形型の凹凸状の彫刻の溝の深さが、導電粒子の直径の0.5倍以上かつ1.1倍以下であることを特徴とする請求項1又は2に記載の異方導電性フィルムの製造方法。
- 前記異方導電性フィルムは、前記導電粒子が分散された接着剤層からなる導電性接着剤層と、前記導電性接着剤層上に積層され、前記導電粒子が分散されていない接着剤層からなる絶縁性接着剤層と、を備えることを特徴する請求項1〜3いずれか一項に記載の異方導電性フィルムの製造方法。
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JPH11260164A (ja) * | 1998-03-05 | 1999-09-24 | Jsr Corp | 異方導電性シートの製造方法及びその製造装置 |
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