JPWO2008139996A1 - フィルム状回路接続材料及び回路部材の接続構造 - Google Patents
フィルム状回路接続材料及び回路部材の接続構造 Download PDFInfo
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- JPWO2008139996A1 JPWO2008139996A1 JP2009514131A JP2009514131A JPWO2008139996A1 JP WO2008139996 A1 JPWO2008139996 A1 JP WO2008139996A1 JP 2009514131 A JP2009514131 A JP 2009514131A JP 2009514131 A JP2009514131 A JP 2009514131A JP WO2008139996 A1 JPWO2008139996 A1 JP WO2008139996A1
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Abstract
Description
本発明のフィルム状回路接続材料(回路接続用接着フィルム)は、第1の回路基板の主面上に第1の回路電極が形成された第1の回路部材と、第2の回路基板の主面上に第2の回路電極が形成された第2の回路部材とを、第1及び第2の回路電極を対向させた状態で電気的に接続する。本発明のフィルム状回路接続材料は、接着剤成分として、フィルム形成材と、ラジカル重合性化合物と、加熱により遊離ラジカルを発生するラジカル重合開始剤と、イソシアネート基含有化合物とを含有し、イソシアネート基含有化合物の含有割合が、フィルム形成材とラジカル重合性化合物との合計100質量部に対して0.09〜5質量部である。
図1は、本発明に係る回路部材の接続構造一実施形態を示す概略断面図である。図1に示す回路部材の接続構造1は相互に対向する第1の回路部材20及び第2の回路部材30を備えており、第1の回路部材20と第2の回路部材30との間には、これらを接続する回路接続部10が設けられている。
図2は、本発明に係る回路部材の接続構造の製造方法の一実施形態を概略断面図により示す工程図である。
ポリスチレン粒子の表面上に、厚み0.2μmのニッケルからなる層を設け、更にこのニッケルからなる層の表面上に、厚み0.04μmの金からなる層を設けた。こうして平均粒径10μmの導電性粒子を得た。
重量平均分子量800のポリカプロラクトンジオール400質量部、2−ヒドロキシプロピルアクリレート131質量部、触媒としてのジブチル錫ジラウレート0.5質量部及び重合禁止剤としてのハイドロキノンモノメチルエーテル1.0質量部を、50℃に加熱しながら攪拌して混合した。次いで、イソホロンジイソシアネート222質量部を滴下し、更に攪拌しながら80℃に昇温してウレタン化反応を進行させた。イソシアネート基の反応率が99%以上になったことを確認後、温度を下げて、ウレタンアクリレートを得た。
ジガルボン酸としてテレフタル酸と、ジオールとしてプロピレングリコールとの反応によりポリエステルポリオールを得た。このポリエステルポリオールをメチルエチルケトン(MEK)に溶解して溶液を得た。得られた溶液を、撹拌機、温度計、コンデンサーおよび真空発生装置と窒素ガス導入管を具備したヒーター付きステンレススチール製オートクレーブに投入した。次いで、上記オートクレーブに、イソシアネートにとして4,4’−ジフェニルメタンジイソシアネートを所定量投入し、触媒としてジブチル錫ラウレートをポリエステルポリオール100質量部に対して0.02質量部となる量投入し、75℃で10時間反応させた後、40℃まで冷却した。さらに、ピペラジンを加えて30分反応させることにより鎖延長した後、トリエチルアミンで中和させた。
フェノキシ樹脂(ユニオンカーバイド社製、商品名「PKHC」、重量平均分子量:45000)50gを、質量比でトルエン(沸点110.6℃、SP値8.90)/酢酸エチル(沸点77.1℃、SP値9.10)=50/50の混合溶剤に溶解して、固形分40質量%の溶液とした。
ディーンスターク還流冷却器、温度計、撹拌器を備えた1000mLのセパラブルフラスコを用意した。そこにジアミン化合物としてポリオキシプロピレンジアミン15.0mmol、2,2−ビス[4−(4−アミノフェノキシ)フェニル]ヘキサフルオロプロパン105.0mmol、非プロトン性極性溶媒としてN−メチル−2−ピロリドン287gを加え、室温(25℃)で30分間撹拌した。次いで、水と共沸可能な芳香族炭化水素系有機溶媒としてトルエン180g、テトラカルボン酸二無水物として4,4’−ヘキサフルオロプロピリデンビスフタル酸二無水物114.0mmolを加え、50℃まで昇温して、その温度で1時間攪拌した後、さらに160℃まで昇温して3時間還流させた。水分定量受器に理論量の水がたまり、水の流出が見られなくなっていることを確認したら、水分定量受器中の水とトルエンを除去し、180℃まで上昇して反応溶液中のトルエンを除去し、ポリイミド樹脂のNMP溶液を得た。
フィルム形成材としてポリエステルウレタン樹脂60質量部、ラジカル重合性化合物として上記ウレタンアクリレート40質量部及びリン酸エステル型アクリレート(共栄社油脂社製、商品名「P2M」)1質量部、イソシアネート基含有化合物としてメタクリロイルイソシアネート0.5質量部、ラジカル重合開始剤としてt−ヘキシルパーオキシ−2−エチルヘキサノエート5質量部を混合した。次に、上記成分100体積部に対して上記導電性粒子を3体積%配合分散させて、回路接続材料を調整した。次いで、この回路接続材料を厚み80μmの片面を表面処理したPETフィルムに塗工装置を用いて塗布して塗膜を得た。次に、その塗膜を70℃で10分間熱風乾燥することにより、厚さが20μmのフィルム状回路接続材料を得た。
メタクリロイルイソシアネート0.5質量部に代えて、ヘキサメチレンジイソシアネート0.5質量部を用いた以外は実施例1と同様にしてフィルム状回路接続材料を得た。
メタクリロイルイソシアネート0.5質量部に代えて、γ−イソシアネートプロピルトリエトキシシラン0.5質量部を用いた以外は実施例1と同様にしてフィルム状回路接続材料を得た。
メタクリロイルイソシアネート0.5質量部に代えて、γ−イソシアネートプロピルトリエトキシシラン0.1質量部を用いた以外は実施例1と同様にしてフィルム状回路接続材料を得た。
メタクリロイルイソシアネート0.5質量部に代えて、γ−イソシアネートプロピルトリエトキシシラン3質量部を用いた以外は実施例1と同様にしてフィルム状回路接続材料を得た。
メタクリロイルイソシアネート0.5質量部に代えて、γ−イソシアネートプロピルトリエトキシシラン5質量部を用いた以外は実施例1と同様にしてフィルム状回路接続材料を得た。
ポリエステルウレタン樹脂60質量部に代えて、フェノキシ樹脂60質量部を用いた以外は実施例5と同様にしてフィルム状回路接続材料を得た。
ポリエステルウレタン樹脂60質量部に代えて、ポリエステルウレタン樹脂55質量部及び含フッ素ポリイミド樹脂5質量部を用いた以外は実施例1と同様にしてフィルム状回路接続材料を得た。
メタクリロイルイソシアネートを使用しない以外は実施例1と同様にフィルム状回路接続材料を得た。
メタクリロイルイソシアネート0.5質量部に代えて、γ−イソシアネートプロピルトリエトキシシラン0.05質量部を用いた以外は実施例1と同様にしてフィルム状回路接続材料を得た。
メタクリロイルイソシアネート0.5質量部に代えて、γ−イソシアネートプロピルトリエトキシシラン7.5質量部を用いた以外は実施例1と同様にしてフィルム状回路接続材料を得た。
ライン幅50μm、ピッチ100μm及び厚み18μmの銅回路配線500本を、ポリイミドフィルムA(宇部興産社製、商品名「ユーピレックス」、厚み75μm)上に、接着剤層を介して形成した3層フレキシブル基板1(FPC基板1)を準備した。また、ライン幅50μm、ピッチ100μm及び厚み8μmの銅回路配線500本をポリイミドフィルムB(宇部興産社製、商品名「ユーピレックス」、厚み25μm)上に直接形成した2層フレキシブル基板2(FPC基板2)を準備した。さらに、ライン幅50μm、ピッチ100μm及び厚み0.4μmのクロム回路配線500本をガラス(コーニング社製、商品名「#1737」)上に直接形成したガラス基板を準備した。
接着性は、下記に示すように、上述のようにして作製した回路部材の接続構造における回路間の接続抵抗及び接着強度の測定、及び、回路部材の接続構造における接続外観の観察をすることで評価した。なお、初期特性評価用サンプルについて、接続抵抗、接着強度及び接続外観の全てが良好であるものを接着性に十分に優れるものとする。
接続抵抗は、マルチメータ(アドバンテスト社製、商品名:TR6848)で測定し、隣接する回路間の抵抗150点の平均(x+3σ)で示した。結果を表4及び5に示す。ここで、表4は、FPC1/ガラス基板接続サンプルの評価結果であり、表5は、FPC2/ガラス基板接続サンプルの評価結果である。
接着強度は、JIS−Z0237に準じて90度剥離法で測定した。接着強度の測定装置としては、テンシロンUTM−4(剥離速度50mm/min、25℃、東洋ボールドウィン社製)を使用した。結果を表4及び5に示す。
回路部材の接続構造を85℃、相対湿度85%RHの恒温恒湿試験装置内に250時間投入し、耐湿試験を行った。そして、接着直後と耐湿試験後の外観をガラス基板側から顕微鏡で観察した。回路接続部と回路間スペース界面との間で剥離が生じた場合、回路間の絶縁性が大幅に低下するためNGと判定した。結果を表4及び5に示す。
実施例及び比較例で得られたフィルム状回路接続材料をそれぞれ真空包装材に収容し、40℃で5日間放置した後、上記と同様にして回路部材の接続構造を作製し、可使時間評価用サンプルとした。そして、可使時間評価用サンプルについても、上記と同様に接着性を評価した。結果を表4及び5に示す。接着性の評価において、可使時間評価用サンプルの各特性が、初期特性評価用サンプルの各特性と比較し変化が小さく、初期特性を維持している場合、可使時間が長いと判定した。
Claims (8)
- 第1の回路基板の主面上に第1の回路電極が形成された第1の回路部材と、第2の回路基板の主面上に第2の回路電極が形成された第2の回路部材とを、前記第1及び前記第2の回路電極を対向させた状態で電気的に接続するためのフィルム状回路接続材料であって、
フィルム形成材と、ラジカル重合性化合物と、加熱により遊離ラジカルを発生するラジカル重合開始剤と、イソシアネート基含有化合物とを含有し、
前記イソシアネート基含有化合物の含有割合が、前記フィルム形成材と前記ラジカル重合性化合物との合計100質量部に対して0.09〜5質量部である、フィルム状回路接続材料。 - 含フッ素有機化合物を更に含有する、請求項1記載のフィルム状回路接続材料。
- 前記フィルム形成材が、重量平均分子量10000以上のウレタン結合を有する有機化合物を含む、請求項1又は2記載のフィルム状回路接続材料。
- 導電性粒子を更に含有する、請求項1〜3のいずれか一項に記載のフィルム状回路接続材料。
- 第1の回路基板の主面上に第1の回路電極が形成された第1の回路部材と、
第2の回路基板の主面上に第2の回路電極が形成され、前記第2の回路電極が前記第1の回路電極と対向配置されるように配置された第2の回路部材と、
前記第1の回路基板と前記第2の回路基板との間に設けられ、前記第1及び前記第2の回路電極が電気的に接続されるように前記第1の回路部材と前記第2の回路部材とを接続する回路接続部と、
を備えた回路部材の接続構造であって、
前記回路接続部が、請求項1〜4のいずれか一項に記載のフィルム状回路接続材料の硬化物である回路部材の接続構造。 - 前記第1及び前記第2の回路電極のうち少なくとも一方は、その表面が金、銀、錫、白金族の金属及びインジウム−錫酸化物からなる群より選ばれる少なくとも一種を含む材料からなる、請求項5記載の回路部材の接続構造。
- 前記第1及び前記第2の回路基板のうち少なくとも一方は、ポリエチレンテレフタレート、ポリエーテルスルホン、エポキシ樹脂、アクリル樹脂、ポリイミド樹脂及びガラスからなる群より選ばれる少なくとも一種を含む材料からなる基板である、請求項5又は6記載の回路部材の接続構造。
- 前記第1及び前記第2の回路部材のうち少なくとも一方と前記回路接続部との間に、窒化シリコン、シリコーン樹脂、ポリイミド樹脂及びアクリル樹脂からなる群より選ばれる少なくとも一種の材料を含む層が形成されている、請求項5〜7のいずれか一項に記載の回路部材の接続構造。
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CN102199404A (zh) | 2011-09-28 |
TWI378751B (ja) | 2012-12-01 |
TWI378745B (ja) | 2012-12-01 |
JP4941554B2 (ja) | 2012-05-30 |
CN102199404B (zh) | 2013-12-04 |
KR20090086465A (ko) | 2009-08-12 |
CN101982515B (zh) | 2013-07-03 |
KR101100507B1 (ko) | 2011-12-29 |
WO2008139996A1 (ja) | 2008-11-20 |
CN101675715B (zh) | 2011-06-08 |
CN101982515A (zh) | 2011-03-02 |
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