JP2018078096A - フィラー含有フィルム - Google Patents
フィラー含有フィルム Download PDFInfo
- Publication number
- JP2018078096A JP2018078096A JP2017159828A JP2017159828A JP2018078096A JP 2018078096 A JP2018078096 A JP 2018078096A JP 2017159828 A JP2017159828 A JP 2017159828A JP 2017159828 A JP2017159828 A JP 2017159828A JP 2018078096 A JP2018078096 A JP 2018078096A
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- JP
- Japan
- Prior art keywords
- filler
- layer
- resin layer
- containing film
- anisotropic conductive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
第1フィラー層のフィラーは樹脂層の一方の表面から露出するか、又は該一方の表面に近接しており、
第2フィラー層のフィラーは樹脂層の他方の表面から露出するか、又は該他方の表面に近接しているフィラー含有フィルムを提供する。特に本発明は、フィラー含有フィルムの好ましい一態様として、フィラーが導電粒子であり、樹脂層が絶縁性樹脂層であり、異方性導電フィルムとして使用されるフィラー含有フィルムを提供する。
樹脂層の一方の表面にフィラーを所定の分散状態で保持させ、そのフィラーを樹脂層に押し込み、樹脂層の他方の表面にも別のフィラーを所定の分断状態で保持させ、そのフィラーを樹脂層に押し込むことを特徴とする製造方法を提供する。
図1Aは、本発明の一実施例のフィラー含有フィルム10Aのフィラー配置を説明する平面図であり、図1BはそのX−X断面図である。
フィラー1A、1Bは、フィラー含有フィルムの用途に応じて、公知の無機系フィラー(金属、金属酸化物、金属窒化物など)、有機系フィラー(樹脂粒子、ゴム粒子など)、有機系材料と無機系材料が混在したフィラー(例えば、コアが樹脂材料で形成され、表面が金属メッキされている粒子(金属被覆樹脂粒子)、導電粒子の表面に絶縁性微粒子を付着させたもの、導電粒子の表面を絶縁処理したもの等)から、硬さ、光学的性能などの用途に求められる性能に応じて適宜選択される。例えば、光学フィルムや艶消しフィルムでは、シリカフィラー、酸化チタンフィラー、スチレンフィラー、アクリルフィラー、メラミンフィラーや種々のチタン酸塩等を使用することができる。コンデンサー用フィルムでは、酸化チタン、チタン酸マグネシウム、チタン酸亜鉛、チタン酸ビスマス、酸化ランタン、チタン酸カルシウム、チタン酸ストロンチウム、チタン酸バリウム、チタン酸ジルコン酸バリウム、チタン酸ジルコン酸鉛及びこれらの混合物等を使用することができる。接着フィルムではポリマー系のゴム粒子、シリコーンゴム粒子等を含有させることができる。異方性導電フィルムでは導電粒子を含有させる。導電粒子としては、ニッケル、コバルト、銀、銅、金、パラジウムなどの金属粒子、ハンダなどの合金粒子、金属被覆樹脂粒子、表面に絶縁性微粒子が付着している金属被覆樹脂粒子などが挙げられる。2種以上を併用することもできる。中でも、金属被覆樹脂粒子が、接続された後に樹脂粒子が反発することで端子との接触が維持され易くなり、導通性能が安定する点から好ましい。また、導電粒子の表面には公知の技術によって、導通特性に支障を来たさない絶縁処理が施されていてもよい。上述の用途別に挙げたフィラーは、当該用途に限定されるものではなく、必要に応じて他の用途のフィラー含有フィルムが含有してもよい。また、各用途のフィラー含有フィルムでは、必要に応じて2種以上のフィラーを併用することができる。
フィラー1A、1Bのフィルム厚方向の位置に関し、図1Bには樹脂層2の一方の表面2aから第1フィラー層のフィラー1Aが露出し、他方の表面2bから第2フィラー層のフィラー1Bが露出している態様を示したが、本発明は、第1フィラー層のフィラー1Aが樹脂層2の一方の表面2aから露出しているか、又はフィラー1Aが樹脂層2内に完全に埋入しているが樹脂層2の表面2aに近接した位置にあり、また、第2フィラー層のフィラー1Bが樹脂層2の他方の表面2bから露出しているか、又は第2フィラー1Bが樹脂層2内に完全に埋入しているが、樹脂層2の表面2bに近接した位置にある態様を含む。ここで、フィラー1A、1Bが樹脂層2に完全に埋入しているが、その表面2a、2bの近傍に位置するとは、一例としてフィラー1A、1Bが樹脂層2から露出せず、かつ後述する埋込率が110%以下、好ましくは105%以下である場合をいう。フィラー1A、1Bが樹脂層2の表面2a、2bから露出していると、フィラー層のフィラー1Bの粒子径は、同一でも異なっていても良い。フィラー含有フィルムを異方性導電フィルムとして構成した場合、異方性導電接続時に導電粒子であるフィラー1A、1Bの捕捉性が顕著に向上するので好ましい。また、フィラー1A、1Bが樹脂層2内に埋入し、かつその表面2a、2bに近接していると、フィラー1A、1Bの捕捉性が損なわれることなく、フィラー含有フィルムのタック性が向上するので好ましい。特に、フィラー1A、1Bが樹脂層2の表面2a、2bに対して0.1μm未満に近接していると、タック性が損なわれることなくフィラー1A、1Bの捕捉性が向上するので好ましい。また、フィラーの個数密度が5000個/mm2以上もしくは面積占有率2%以上のフィラー層は、フィラー1A、1Bが樹脂層2内に埋入し、かつ樹脂層2の表面2a、2bと略面一であることが好ましい。これにより、フィラーが樹脂層から露出している場合に比してフィラー含有フィルムのタック性が低下せず、かつ埋込率が100%を超えてフィラーが完全に埋め込まれている場合に比して、フィラー含有フィルムを異方性導電フィルムとして構成した場合、異方性導電接続時に導電粒子であるフィラーが樹脂流動の影響を受けにくくなり、捕捉性が向上する。これに対し、第1フィラー層及び第2フィラー層のいずれか一方でも樹脂層2から露出せず、かつ樹脂層2の表面2a、2bの近傍にも位置しないと、フィラー含有フィルムを異方性導電フィルムとして構成した場合、異方性導電接続時に導電粒子であるフィラーが樹脂流動の影響を受け易くなり、捕捉性の低下が懸念される。もしくは、フィラー近傍の樹脂排除が均一にはなり難くなることで、フィラーの押し込みに悪影響を及ぼすことも懸念される。これは異方性導電フィルム以外のフィラー含有フィルムにおいても、同様のことが言える。
図1Aに示したフィラー含有フィルム10Aにおいて、第1フィラー層のフィラー1Aと第2フィラー層のフィラー1Bはそれぞれ正方格子に配列している。このように本発明のフィラー含有フィルムにおいて、フィラー1A、1Bは規則的に配列していることが好ましい。規則的な配列としては、図1Aに示した正方格子の他に、長方格子、斜方格子、6方格子等の格子配列をあげることができる。格子配列の以外の規則的な配列としては、フィラーが所定間隔で直線状に並んだ粒子列が所定の間隔で並列しているものをあげることができる。フィラー1A、1Bを格子状等の規則的な配列にすることにより、フィラー含有フィルムを異方性導電フィルムとして構成した場合、異方性導電接続時に導電粒子である各フィラー1A、1Bに圧力を均等に加え、導通抵抗のばらつきを低減させることができる。
本発明のフィラー含有フィルム全体のフィラーの個数密度は、その用途や求められる特性とフィラー1A、1Bの粒子径、配列等に応じて適宜調整されるので特に限定はされないが、下記の異方性導電フィルムの場合を適用することができる。フィラー含有フィルムとしての製造条件は、異方性導電フィルムの場合と概ね同じになるため、フィラーの個数密度の条件もと概ね同様になると考えて差し支えない。フィラー含有フィルムを異方性導電フィルムとして構成した場合、異方性導電フィルムで接続する電子部品における端子のピッチ、異方性導電フィルムにおけるフィラー(導電粒子)1A、1Bの粒子径、配列等に応じて適宜調整される。例えば個数密度の上限に関しては、ショート抑制のために70000個/mm2以下が好ましく、50000個/mm2以下がより好ましく、35000個/mm2以下が更により好ましい。一方、個数密度の下限に関しては、コスト抑制のためにフィラー(導電粒子)を削減し且つ導通性能を満足させるためにも、100/mm2以上が好ましく、150/mm2個以上が好ましく、400個/mm2以上が更により好ましい。特に、異方性導電フィルムで接続する電子部品の最小の端子の接続面積が2000μm2以下のファインピッチ用途とする場合には、10000個/mm2以上が好ましい。第1フィラー層のフィラー1Aの設計上の個数密度と第2フィラー層のフィラー1Bの設計上の個数密度は等しくても、異なっていてもよい。
(樹脂層の粘度)
樹脂層2の最低溶融粘度は、特に制限はなく、フィラー含有フィルムの用途や、フィラー含有フィルムの製造方法等に応じて適宜定めることができる。例えば、上述の凹み2x、2yを形成できる限り、フィラー含有フィルムの製造方法によっては1000Pa・s程度とすることもできる。一方、フィラー含有フィルムの製造方法として、フィラーを樹脂層の表面に所定の配置で保持させ、そのフィラーを樹脂層に押し込む方法を行うとき、樹脂層がフィルム成形を可能とする点から樹脂の最低溶融粘度を1100Pa・s以上とすることが好ましい。凹み2x、2yは両面にあってもよく、片面(即ち、フィラー1A、1Bのいづれか一方)だけであってもよい。
図1B、図4に示すようなフィラー含有フィルムの 「凹み」2x、2yは、「傾斜」もしくは「起伏」という観点から説明することもできる。以下に、図面を参照しながら説明する。
本発明の異方性導電フィルム等のフィラー含有フィルムでは、樹脂層2の層厚Laと全フィラー1A、1Bの平均粒子径DA、DBとの比(La/DA)、(La/DB)は、好ましくは0.3以上、0.6〜10、より好ましくは0.6〜8、さらに好ましくは0.6〜6である。平均粒子径DA、DBとしては、第1フィラー層のフィラー1Aと第2フィラー層のフィラー1Bのそれぞれの平均粒子径が異なる場合に、これらの平均としてもよい。樹脂層2の層厚Laが大き過ぎてこの比が10を上回ると、フィラー含有フィルムを異方性導電フィルムとして構成した場合、異方性導電接続時に導電粒子であるフィラー1A、1Bが位置ズレしやすくなり、端子におけるフィラー1A、1Bの捕捉性が低下する。反対に樹脂層2の層厚Laが小さすぎてこの比が0.6未満となると、樹脂層2でフィラー1A、1Bを所定の配列に維持することが困難となる。
樹脂層2は、フィラー含有フィルムの用途に応じて導電性でも絶縁性でもよく、また、可塑性でも硬化性であってもよいが、好ましくは絶縁性の硬化性樹脂組成物から形成することができ、例えば、熱重合性化合物と熱重合開始剤とを含有する絶縁性の熱重合性組成物から形成することができる。熱重合性組成物には必要に応じて光重合開始剤を含有させてもよい。これらは、公知の樹脂や化合物を用いることができる。以下、フィラー含有フィルムの一態様における異方性導電フィルムを主として、絶縁性樹脂の場合を説明する。
(フィラーユニット)
本発明のフィラー含有フィルムは、フィラーの配列に関し、種々の態様をとることができる。
第1フィラー層及び第2フィラー層の一方のフィラー層を、設計上、所定の配列及び所定の個数密度で形成し、その後全領域についてフィラーの配列と個数密度を確認し、その一方の導電粒子層の粒子配置に合わせるように、さらに必要に応じて一方のフィラー層の粒子配置における抜けを補うように、他方のフィラー層を形成し、異方性導電フィルム等のフィラー含有フィルム全体として、フィラーを所定の配置とし、かつ抜けを解消してもよい。したがって後から形成されるフィラー層は、フィラー含有フィルムの長手方向に個数密度が変化していてもよい。このようにすることで、フィラー含有フィルムの歩留まりが向上し、コスト削減の効果が期待できる。
図11Aに示した異方性導電フィルム等のフィラー含有フィルム10Eのように、フィラー分散層3の一方の表面に、フィラー分散層3を形成する樹脂層2よりも好ましくは最低溶融粘度が低い第2の樹脂層4を積層してもよい。また、第1フィラー層と第2フィラー層の樹脂層2における埋込率が異なり、第1フィラー層が第2フィラー層よりも樹脂層から露出している場合に、図11Bに示した異方性導電フィルム等のフィラー含有フィルム10Fのように樹脂層2からの突出量が大きい第1樹脂層側に第2の樹脂層4を積層してもよく、図11Cに示した異方性導電フィルム等のフィラー含有フィルム10Gのように、フィラー層が突出していない樹脂層2の表面に第2の樹脂層4を積層してもよい。第2の樹脂層4の積層により、異方性導電フィルム等のフィラー含有フィルムを用いて電子部品を異方性導電接続するときに、電子部品の電極やバンプによって形成される空間を充填し、接着性を向上させることができる。なお、第2の樹脂層4を積層する場合、第2の樹脂層4がツールで加圧する電子部品に貼られるようにする(樹脂層2がステージに載置される電子部品に貼られるようにする)ことが好ましい。このようにすることで、フィラーの不本意な移動を避けることができ、捕捉性を向上させることができる。
第2の樹脂層4と樹脂層2を挟んで反対側に第3の樹脂層が設けられていてもよい。第3の樹脂層をタック層として機能させることができる。
フィラー含有フィルムの用途によっては、複数のフィラー分散層3を積層してもよく、積層したフィラー分散層間に、第2の樹脂層のようにフィラーを含有していない層を介在していてもよく、最外層に第2の樹脂層や第3の樹脂層を設けてもよい。
樹脂層として、フィラー分散層3の単層を有する本発明のフィラー含有フィルムは、例えば、樹脂層2の一方の表面にフィラー1Aを所定の分散で保持(好ましくは所定の配列で保持)させ、そのフィラー1Aを平板又はローラー等で樹脂層2に押し込み、樹脂層2の他方の表面にも、同様にフィラー1Bを所定の分散で保持(好ましくは所定の配列で保持)させ押し込むことにより得ることができる。また、樹脂層の両面にフィラーを所定の分散状態で保持させる際に、塗工ロールを用いて付着させたり、転写型を用いて付着させたり、様々な手法で付着させることが可能であるが、樹脂層の一方の表面においてフィラーを保持させる方向と、他方の表面においてフィラーを保持させる方向を反転(180度)させることが好ましい。これによりフィルムの表面におけるフィラーの分散状態の不均一性と、裏面におけるフィラーの分散状態の不均性とを、表裏一体で見たときに緩和することが可能となる。
本発明のフィラー含有フィルムは、従前のフィラー含有フィルムと同様に使用することができ、フィラー含有フィルムを貼り合わせることができれば物品に特に制限はない。フィラー含有フィルムの用途に応じた種々の物品に圧着により、好ましくは熱圧着により貼着することができる。この貼り合わせ時には光照射を利用してもよく、熱と光を併用してもよい。例えば、フィラー含有フィルムの樹脂層が、該フィラー含有フィルムを貼り合わせる物品に対して十分な粘着性を有する場合、フィラー含有フィルムの樹脂層を物品に軽く押し付けることによりフィラー含有フィルムが一つの物品の表面に貼着したフィルム貼着体を得ることができる。この場合に、物品の表面は平面に限られず、凹凸があってもよく、全体として屈曲していてもよい。物品がフィルム状又は平板状である場合には、圧着ローラーを用いてフィラー含有フィルムをそれらの物品に貼り合わせてもよい。これにより、フィラー含有フィルムのフィラーと物品を直接的に接合させることもできる。
(1)異方導電性フィルムの製造
(1-1)実施例1A、1B〜実施例8
表1に示した配合で、(i)導電粒子分散層を形成する高粘度の第1の絶縁性樹脂層(以下、A層ともいう)、(ii)第1の絶縁性樹脂層よりも低粘度の第2の絶縁性樹脂層(以下、N層ともいう)、及び(iii)タック層を形成する第3の絶縁性樹脂層を形成する樹脂組成物を調製した。
実施例1と同様に、表1に示した樹脂組成の第1の絶縁性樹脂層(A層)、第2の絶縁性樹脂層(N層)、第3の絶縁性樹脂層(タック層)を形成した。
(1)で作製した実施例及び比較例の異方性導電フィルムに対し、接続に十分な面積で截断し、以下のようにして(a)初期導通抵抗、(b)信頼性試験後の導通抵抗、(c)粒子捕捉性、(d)ショート率、(e)仮圧着性を測定ないし評価した。結果を表2及び表3に示す。
(a1)FOG用異方性導電フィルムの導通特性の評価(実施例1A、1B)
異方性導電フィルムの試料を導通特性の評価用FPCとガラス基板との間に挟み、ツール幅1.5mm、加熱加圧(200℃、5MPa、5sec)し、各評価用接続物を得、得られた評価用接続物の導通抵抗を測定した。初期導通抵抗は実用上1Ω以下が望ましい。そこで初期導通1Ω以下をOK、1Ωを超える場合をNGとした。
端子ピッチ 50μm
端子幅:端子間スペース=1:1
ポリイミドフィルム厚/銅箔厚(PI/Cu)=38/8、Sn plating
電極 ITO coating
厚み 0.7mm
異方性導電フィルムの試料を導通特性の評価用ICとガラス基板との間に挟み、加熱加圧(180℃、80MPa、5秒)して各評価用接続物を得、得られた評価用接続物の導通抵抗を測定した。初期導通抵抗は実用上1Ω以下が望ましい。そこで、初期導通抵抗1Ω以下をOK、1Ωを超える場合をNGと評価した。
外形 1.8×20.0mm
厚み 0.5mm
バンプ仕様 サイズ30×85μm、バンプ間距離50μm、バンプ高さ15μm
ガラス材質 コーニング社製1737F
外形 30×50mm
厚み 0.5mm
電極 ITO配線
(a)で作製した評価用接続物を、温度85℃、湿度85%RHの恒温槽に500時間おいた後の導通抵抗を、初期導通抵抗と同様に測定した。信頼性試験後の導通抵抗は実用上6Ω以下が望ましい。そこで、6Ω以下をOK、6Ωを超える場合をNGとした。
(c1)FOG用異方性導電フィルムの粒子捕捉性の評価(実施例1A、1B)
導通特性評価用の接続物において、接続部分のFPC端子のうち25×400μmの領域の100個について、導電粒子の捕捉数を計測し、最低捕捉数を求め、次の基準で評価した。
A(良好):3個以上
B(実用上問題なし):3個未満
粒子捕捉性の評価用ICを使用し、この評価用ICと、端子パターンが対応するガラス基板とを、アライメントを6μmずらして加熱加圧(180℃、80MPa、5秒)し、評価用ICのバンプと基板の端子とが重なる6μm×66.6μmの領域の100個について導電粒子の捕捉数を計測し、最低捕捉数を求め、次の基準で評価した。実用上、B評価以上であることが好ましい。
外形 1.6×29.8mm
厚み 0.3mm
バンプ仕様 サイズ12×66.6μm、バンプピッチ22μm、バンプ高さ12μm
A(良好):5個以上
B(実用上問題なし):3個以上5個未満
C(不良):3個未満
(d1)FOG用異方性導電フィルムのショート率の評価(実施例1A、1B)
導通特性の評価用FPCと同じFPCをノンアルカリガラス(厚み0.7mm)に加熱加圧(200℃、5MPa、5sec)し、得られた評価用接続物のショート数を計測し、計測されたショート数と評価用接続物のギャップ数からショート発生率を求め次の基準で評価した。
A(良好):50ppm未満
B(実用上問題なし):50ppm以上200ppm未満
C(不良):200ppm以上
ショート率の評価用ICを使用し、(a)初期導通抵抗の評価と同様にして評価用接続物を得、得られた評価用接続物のショート数を計測し、計測されたショート数と評価用接続物のギャップ数からショート発生率を求め、次の基準で評価した。
外形 15×13mm
厚み0.5mm
バンプ仕様 サイズ25×140μm、バンプ間距離7.5μm、バンプ高さ15μm
A:50ppm未満
B:50ppm以上200ppm未満
C:200ppm以上
圧着ツールを用いて、PETフィルム付の異方性導電フィルム(幅1.5mm、長さ50mm)をITOガラスに温度60℃又は70℃、圧着圧力1MPa、圧着時間1秒で押し付けることにより仮圧着した。この場合、圧着ツールとPETフィルムとの間には緩衝材としてシリコンラバー350μm厚を介在させた。こうして異方性導電フィルムをITOガラスに押し付けた仮圧着サンプル100個についてPETフィルムを剥がした。その際、仮圧着の成否を、PETフィルムと共に異方性導電フィルムがITOガラスから1個も剥離しなかった場合をOK、1個でも剥離した場合をNGと便宜的に判定した。
A:60℃以上でOK
B:70℃以上でOK
C:70℃以上でNG
実施例1の異方導電性フィルムについて、第1導電粒子層の形成時(1回目)の導電粒子の転写率と第2導電粒子層形成時(2回目)の導電粒子の転写率をそれぞれ計測した。
ここで転写率は、樹脂型に充填した導電粒子数に対する、第1の絶縁性樹脂層に転写した導電粒子数の割合である。
1C、1C1、1C2 フィラーユニット
2 樹脂層
2a、2b 樹脂層の表面
2x 凹み
2y 凹み
3 フィラー分散層
4 第2の樹脂層
10、10A、10B、10C、10D、10E、10F、10G 実施例のフィラー含有フィルム
10Ap フィラー含有フィルムの一端
10Aq フィラー含有フィルムの他端
20、21 端子
30 第1電子部品
31 第2電子部品
A フィラーの配列の格子軸
DA、DB 粒子径
La 樹脂層の層厚
L1、L2 埋込量
L3 第1フィラー層内のフィラー間の最近接粒子間距離
L4 第2フィラー層内のフィラー間の最近接粒子間距離
Lc フィラーの露出部分の径
Ld 凹み(傾斜)の最大径
Le 凹み(傾斜)の最大深さ
Lf 凹み(起伏)の最大深さ
θ 端子の長手方向と導電粒子の配列の格子軸とのなす角度
Claims (17)
- 樹脂層と、該樹脂層に単層で分散しているフィラーからなる第1フィラー層と、第1フィラー層と異なる深さで該樹脂層に単層で分散しているフィラーからなる第2フィラー層とを有するフィラー分散層を備えたフィラー含有フィルムであって、
第1フィラー層のフィラーは該樹脂層の一方の表面から露出するか、又は該一方の表面に近接しており、
第2フィラー層のフィラーは該樹脂層の他方の表面から露出するか、又は該他方の表面に近接しているフィラー含有フィルム。 - 樹脂層の層厚(La)とフィラーの平均粒子径Dとの比(La/D)が0.6〜10である請求項1記載のフィラー含有フィルム。
- フィラー含有フィルムの長手方向に、第1フィラー層のフィラーの個数密度及び第2フィラー層のフィラーの個数密度の一方が漸次増加し、他方が漸次減少している請求項1又は2記載のフィラー含有フィルム。
- 第1フィラー層のフィラー同士又は第2フィラー層のフィラー同士が接触又は近接してなるフィラーユニットが形成されており、フィラーユニット同士が接触せず、フィラーユニットが規則的に配列している請求項1〜3のいずれかに記載のフィラー含有フィルム。
- 第1フィラー層のフィラーと第2フィラー層のフィラーとが接触又は近接してなるフィラーユニットが形成されており、フィラーユニット同士が接触せず、フィラーユニットが規則的に配列している請求項1〜3のいずれかに記載のフィラー含有フィルム。
- 平面視にて、第1フィラー層のフィラーユニットの長手方向と第2フィラー層のフィラーユニットの長手方向とが非平行である請求項4記載のフィラー含有フィルム。
- フィラー分散層と、第2のフィラー樹脂層とが積層しており、第2のフィラー樹脂層はフィラー分散層を形成する樹脂層に比して最低溶融粘度が低い請求項1〜6のいずれかに記載のフィラー含有フィルム。
- フィラー近傍の樹脂層の表面が、隣接するフィラー間の中央部における樹脂層の接平面に対して傾斜もしくは起伏を有し、該傾斜では、フィラーの周りの樹脂層の表面が前記接平面に対して欠けており、該起伏では、フィラー直上の樹脂層の樹脂量が、該フィラー直上の樹脂層の表面が前記接平面にあるとしたときに比して少なくなっている請求項1〜7のいずれかに記載のフィラー含有フィルム。
- フィラーが導電粒子であり、樹脂層が絶縁性樹脂層であり、異方性導電フィルムとして使用される請求項1〜8のいずれかに記載のフィラー含有フィルム。
- 請求項1〜8のいずれかに記載のフィラー含有フィルムの製造方法であって、
樹脂層の一方の表面にフィラーを所定の分散状態で保持させ、そのフィラーを樹脂層に押し込み、樹脂層の他方の表面にも別のフィラーを所定の分断状態で保持させ、そのフィラーを樹脂層に押し込むことを特徴とする製造方法。 - フィラーが導電粒子であり、樹脂層が絶縁性樹脂層であり、異方性導電フィルムとして使用される請求項1〜8のいずれかに記載のフィラー含有フィルムの製造方法であって、
樹脂層の一方の表面にフィラーを所定の分散状態で保持させ、そのフィラーを樹脂層に押し込み、樹脂層の他方の表面にも別のフィラーを所定の分断状態で保持させ、そのフィラーを樹脂層に押し込むことを特徴とする製造方法。 - 樹脂層の両面にフィラーを所定の分散状態で保持させる際に、樹脂層の一方の表面においてフィラーを保持させる方向と、他方の表面においてフィラーを保持させる方向を反転させる請求項10又は11記載の製造方法。
- 請求項1〜9のいずれかに記載のフィラー含有フィルムが物品に貼着しているフィルム貼着体。
- 請求項1〜9のいずれかに記載のフィラー含有フィルムを介して第1物品と第2物品とが接続されている接続構造体。
- 請求項9記載のフィラー含有フィルムを介して第1電子部品と第2電子部品とが異方性導電接続されている請求項14記載の接続構造体。
- 請求項1〜9のいずれかに記載のフィラー含有フィルムを介して第1物品と第2物品を圧着する接続構造体の製造方法。
- 第1物品、第2物品をそれぞれ第1電子部品、第2電子部品とし、請求項9記載のフィラー含有フィルムを介して第1電子部品と第2電子部品を熱圧着することにより第1電子部品と第2電子部品が異方性導電接続された接続構造体を製造する請求項15記載の接続構造体の製造方法。
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