JP2001240816A - 異方導電性接着フィルム - Google Patents
異方導電性接着フィルムInfo
- Publication number
- JP2001240816A JP2001240816A JP2000050180A JP2000050180A JP2001240816A JP 2001240816 A JP2001240816 A JP 2001240816A JP 2000050180 A JP2000050180 A JP 2000050180A JP 2000050180 A JP2000050180 A JP 2000050180A JP 2001240816 A JP2001240816 A JP 2001240816A
- Authority
- JP
- Japan
- Prior art keywords
- adhesive layer
- insulating adhesive
- circuit board
- 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.)
- Granted
Links
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/10—Adhesives in the form of films or foils without carriers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
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- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/04—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation using electrically conductive adhesives
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Abstract
テルベースのフレキシブル回路基板にICチップ等の電
子部品を実装する場合に、接着性や導通信頼性を向上さ
せる。 【解決手段】 異方導電性接着フィルム1Aが、第1の
絶縁性接着剤層2と、硬化後の弾性率が第1の絶縁性接
着剤層2の硬化後の弾性率よりも低い第2の絶縁性接着
剤層3と、第1の絶縁性接着剤層2又は第2の絶縁性接
着剤層3の少なくとも一方に分散している導電粒子4か
らなる。
Description
電子部品と回路基板との電気的機械的接続に使用する異
方導電性接着フィルムに関し、特に、ポリエステルベー
スのフレキシブル回路基板に半導体チップをフリップチ
ップ実装する場合に好適な異方導電性接着フィルムに関
する。
基板、あるいは回路基板同士を電気的機械的に接続する
ために異方導電性接着フィルム(ACF)が使用されて
いるが、近年では特に携帯電話やICカード等の分野に
おいて、フレキシブル回路基板(FPC)上にICチッ
プをフリップチップ実装(COF)するために異方導電
性接着フィルムが広く使用されている。
に、エポキシ樹脂系の単層の絶縁性接着剤層中に導電粒
子を分散させた単層構造のものが使用されている。ま
た、同一組成の絶縁性接着剤で導電粒子を分散させた層
と分散させない層との二層構造としたものや、導電粒子
を分散させた絶縁性接着剤層と、その絶縁性接着剤と組
成の一部を変えた絶縁性接着剤からなる層との二層構造
のものも知られている。
は、価格競争のためにコスト低減の要求が強い。そのた
め、これらの分野で使用するフレキシブル回路基板とし
ては、従前のポリイミドベースのものに対して、ポリエ
ステルベースのものが多用されるようになっている。
ステルベースのフレキシブル回路基板はその表面性の影
響でポリイミドベースのものに比して接着性が低く、一
方、従来のエポキシ樹脂系の絶縁性接着剤を用いた異方
導電性接着フィルムは弾性率が高いため、電子部品を実
装するフレキシブル回路基板をポリイミドベースのもの
からポリエステルベースのものに変更すると電子部品と
回路基板との接着性が低下するという問題があった。
の絶縁性接着剤として、接着性が高く弾性率の低いアク
リレート系のものを使用することが試みられたが、その
場合には、接着性は向上しても導通信頼性が劣るという
問題が生じた。
ブル回路基板にICチップ等の電子部品を実装する場合
に従来の異方導電性接着フィルムを用いると、接着性や
導通信頼性に関して、所定のスペックを満足させること
ができないという問題が生じた。
解決しようとするものであり、異方導電性接着フィルム
を用いて、ポリエステルベースのフレキシブル回路基板
にICチップ等の電子部品を実装する場合でも、高い接
着性や導通信頼性を得られるようにすることを目的とす
る。
性接着フィルムを用いて、ポリエステルベースのフレキ
シブル回路基板にICチップ等の電子部品を実装する場
合に、異方導電性接着フィルムを構成する絶縁性接着剤
層を、電子部品側の層とフレキシブル回路基板側の層と
を有する複層構成とし、フレキシブル回路基板側の絶縁
性接着剤層の硬化後の弾性率を、電子部品側の絶縁性接
着剤層の硬化後の弾性率よりも低くすることにより、接
着性と導通信頼性を共に向上させられることを見出し、
本発明を完成させるに至った。
層と、硬化後の弾性率が第1の絶縁性接着剤層の硬化後
の弾性率よりも低い第2の絶縁性接着剤層と、第1の絶
縁性接着剤層又は第2の絶縁性接着剤層の少なくとも一
方に分散している導電粒子からなる異方導電性接着フィ
ルムを提供する。
ィルムを用いて半導体チップと回路基板とを電気的機械
的に接続する方法であって、異方導電性接着フィルムの
第1の絶縁性接着剤層を半導体チップ側に配し、第2の
絶縁性接着剤層を回路基板側に配する接続方法を提供す
る。
フィルムを用いて半導体チップと回路基板とを電気的機
械的に接続した接続構造体であって、異方導電性接着フ
ィルムの第1の絶縁性接着剤層の硬化物が半導体チップ
と接着し、第2の絶縁性接着剤層の硬化物が回路基板と
接着している接続構造体を提供する。
詳細に説明する。なお、各図中、同一符号は同一又は同
等の構成要素を表している。
1Aを用いて、ICチップ10と回路基板20とを接続
する方法の説明図である。
縁性接着剤層2と、第2の絶縁性接着剤層3との二層構
造となっており、これら双方の絶縁性接着剤層2、3に
はそれぞれ導電粒子4が分散している。
は、第1の絶縁性接着剤層2の硬化後の弾性率c1が、
第2の絶縁性接着剤層3の硬化後の弾性率c2よりも大
きいことを特徴としている。絶縁性接着剤層2、3の硬
化後の弾性率の比c1/c2は、好ましくは10以上であ
る。これにより、ICチップ10と回路基板20とを異
方導電性接着フィルム1Aを用いて接続する場合に、回
路基板20がポリエステルベースの基材フィルム21に
配線回路22を設けたものであっても、第1の絶縁性接
着剤層2側をICチップ10側に配し、第2の絶縁性接
着剤層3を回路基板20側に配して接続することによ
り、回路基板がポリイミドベースである場合と同等以上
に接着性と導通信頼性の双方を向上させることができ
る。
の弾性率を異ならせる方法としては、特に制限はない
が、同種の絶縁性樹脂を用いると硬化剤の種類や添加量
等を調整しても硬化後の弾性率を十分に異ならせること
が難しいので、異種の絶縁性樹脂を用いることが好まし
い。例えば、第1の絶縁性接着剤層2を熱硬化性エポキ
シ系接着剤等から形成し、第2の絶縁性接着剤層3を熱
硬化性アクリレート系接着剤等から形成する。特に、保
存性と速硬化性等の特性面から、第1の絶縁性接着剤層
2をイミダゾール系潜在性硬化剤を用いた熱硬化性エポ
キシ系接着剤から形成し、第2の絶縁性接着剤層3をパ
ーオキサイド系硬化剤を用いた熱硬化性アクリレート系
接着剤から形成することが好ましい。この場合、熱硬化
性エポキシ系接着剤は、ビスフェノールA型エポキシ樹
脂、ビスフェノールF型エポキシ樹脂、テトラブロモビ
スフェノールA型エポキシ樹脂等の一般的なエポキシ樹
脂から構成することができる。また、熱硬化性アクリレ
ート系接着剤は、反応性二重結合を有するウレタンアク
リレート、ポリエステルアクリレート、エポキシアクリ
レート等から構成することができる。
の絶縁性接着剤層3の厚みt2との比t1/t2は、0.
15以上7以下とすることが好ましい。この比t1/t2
が0.15未満であると第1の絶縁性接着剤層2の形成
効果が十分に現れず、導通信頼性が低下する。反対に、
比t1/t2が7を超えると第2の絶縁性接着剤層3の形
成効果が十分に現れず、接着性が低下する。
の絶縁性接着剤層3の厚みt2との合計の厚みは、従来
の単層の異方導電性接着フィルムと同様とすることがで
き、通常、10〜100μmとすることが好ましい。
i、Ag、Cu又はこれらの合金等からなる金属粉、球
状樹脂粒子の表面に金属メッキを施したもの、これら電
気的良導体からなる粒子の表面に絶縁性樹脂被膜を設け
たものなど、従来より異方導電性接着剤に用いられてい
る種々の導電性粒子を使用することができる。導電性粒
子の粒径は、0.2〜20μmとすることが好ましい。
また、第1の絶縁性接着剤層2に分散させる導電粒子4
と、第2の絶縁性接着剤層3に分散させる導電粒子4と
は、同一のものを使用してもよく、異なるものを使用し
てもよい。
しては、第1の絶縁性接着剤層形成用組成物と第2の絶
縁性接着剤層形成用組成物中にそれぞれ導電粒子4を常
法により分散させ、フィルム化し、得られた2枚のフィ
ルムを重ね合わせて圧着することにより製造できる。ま
た、導電粒子4を分散させた第1の絶縁性接着剤層2又
は第2の絶縁性接着剤層3の一方を形成した後、その上
にもう一方の導電粒子4を分散させた絶縁性接着剤形成
用組成物を塗布し、フィルム化することにより形成して
もよい。生産性の点からは、各々のフィルムを重ね合わ
せる方法が好ましい。
後の弾性率の異なる2層の絶縁性接着剤層を設ける限り
種々の態様をとることができる。例えば、上述の図1の
異方導電性接着フィルム1Aでは導電粒子4が第1の絶
縁性接着剤層2と第2の絶縁性接着剤層3の双方に分散
されているが、図2の異方導電性接着フィルム1Bのよ
うに、導電粒子4を第1の絶縁性接着剤層2には分散さ
せず、第2の絶縁性接着剤層3のみに分散させてもよ
い。これにより、バンプ面積の小さいファインパターン
の場合に、パターンがより多くの導電粒子を捕捉できる
ようになるので好ましい。
2の絶縁性接着剤層3には分散させず、第1の絶縁性接
着剤層2のみに分散させてもよい。
おいては、硬化後の弾性率の異なる2層の絶縁性接着剤
層の他に、必要に応じて他の絶縁性接着剤層を第1の絶
縁性接着剤層2と第2の絶縁性接着剤層3との間に設け
た三層以上の多層構造としてもよい。
の電子部品と回路基板との接続や、回路基板同士の接続
等に使用することができる。この場合、接続対象とする
回路基板としては、ポリエステルベースの回路基板、ポ
リイミドベースの回路基板、等をあげることができる。
エステルベースの回路基板にフリップチップ実装する場
合に、本発明の異方導電性接着フィルムの第1の絶縁性
接着剤層を半導体チップ側に配し、第2の絶縁性接着剤
層を回路基板側に配して接続することにより、従来の異
方導電性接着フィルムを使用した場合に比して、接着性
や導通信頼性を顕著に向上させることができる。したが
って、本発明は、かかる接続方法やかかる接続方法によ
り接続された接続構造体も包含する。
明する。
3に示した厚さで作製し、得られたフィルムを表2又は
表3に示した組み合わせで重ね合わせ、圧着することに
より二層構造の異方導電性接着フィルムを作製した。ま
た、各フィルム1〜5を熱プレスにより50μm厚のフ
ィルム状に硬化させ、硬化後の弾性率(30℃)を動的
粘弾性測定装置(オリエンテック社)により求めた。結
果を表1に示す。
ミニウムの配線パターンが形成されているフレキシブル
回路基板と、ICチップ(4×4mm□、ICチップの
厚みt=0.15mm)とを、各実施例及び比較例の異
方導電性接着フィルムを介して加熱加圧(200℃、1
N/バンプ、10秒)することにより接続した。
通信頼性、(3)耐衝撃性を、次のように評価した。結果
を表2及び表3に示す。
を90゜方向に50mm/minの引っ張り速度で剥離
し、このときの剥離強度を測定した。なお、剥離強度が
4N/cm以上であれば十分な接続信頼性が得られ、2
N/cm以上であれば若干信頼性は低下するが十分に実
用性があり、2N/cm未満であればNGである。
値が、エージング前の初期抵抗値の2倍未満の場合を
○、2倍以上5倍未満の場合を△、5倍以上の場合を×
と評価した。
1N程度の軽衝撃を与えた後の抵抗値が、軽衝撃を与え
る前の初期抵抗値の2倍未満の場合を○、2倍以上5倍
未満の場合を△、5倍以上の場合を×と評価した。
ルム1(弾性率:2 GPa)を単層で用いた比較例2で
は、接着性が低く、アクリレート系のフィルム2(弾性
率:2×10-2 GPa)を単層で用いた比較例3では、導通
信頼性と耐衝撃性が劣っていることがわかる。また、こ
れらフィルム1とフィルム2の二層構造にした場合で
も、フィルム1を基板側に配し、フィルム2をチップ側
に配して接続した比較例1では接着強度が比較的低く、
導通信頼性や耐衝撃性も劣っていることがわかる。
性率:2 GPa)をチップ側に配し、アクリレート系のフ
ィルム2〜5(弾性率:2×10-2〜3×10-1 GPa)を基板
側に配して接続した実施例1〜10では、接着強度、導
通信頼性、耐衝撃性のいずれも優れており、特に、フィ
ルム1とフィルム2〜5との弾性率の比が10以上で、
厚さの比が0.15以上7以下である実施例1〜7にお
いては、接着強度、導通信頼性、耐衝撃性がさらに優れ
ていることがわかる。
ば、ポリエステルベースのフレキシブル回路基板にIC
チップ等の電子部品を実装する場合でも、高い接着性や
導通信頼性を得ることが可能となる。
Claims (9)
- 【請求項1】 第1の絶縁性接着剤層と、硬化後の弾性
率が第1の絶縁性接着剤層の硬化後の弾性率よりも低い
第2の絶縁性接着剤層と、第1の絶縁性接着剤層又は第
2の絶縁性接着剤層の少なくとも一方に分散している導
電粒子からなる異方導電性接着フィルム。 - 【請求項2】 第1の絶縁性接着剤層の硬化後の弾性率
c1と第2の絶縁性接着剤層の硬化後の弾性率c2の比c
1/c2が10以上である請求項1記載の異方導電性接着
フィルム。 - 【請求項3】 第1の絶縁性接着剤層の厚みt1と第2
の絶縁性接着剤層の厚みt2との比t1/t2が0.15
以上7以下である請求項2記載の異方導電性接着フィル
ム。 - 【請求項4】 第1の絶縁性接着剤層がイミダゾール系
潜在性硬化剤を用いた熱硬化性エポキシ系接着剤からな
り、第2の絶縁性接着剤層がパーオキサイド系硬化剤を
用いた熱硬化性アクリレート系接着剤からなる請求項1
〜3のいずれかに記載の異方導電性接着フィルム。 - 【請求項5】 導電粒子が第2の絶縁性接着剤層に分散
している請求項1〜4のいずれかに記載の異方導電性接
着フィルム。 - 【請求項6】 半導体チップと回路基板とを請求項1〜
5のいずれかに記載の異方導電性接着フィルムを用いて
電気的機械的に接続する方法であって、異方導電性接着
フィルムの第1の絶縁性接着剤層を半導体チップ側に配
し、第2の絶縁性接着剤層を回路基板側に配する接続方
法。 - 【請求項7】 回路基板がポリエステルベースの回路基
板である請求項6記載の接続方法。 - 【請求項8】 半導体チップと回路基板とを請求項1〜
5のいずれかに記載の異方導電性接着フィルムを用いて
電気的機械的に接続した接続構造体であって、異方導電
性接着フィルムの第1の絶縁性接着剤層の硬化物が半導
体チップと接着し、第2の絶縁性接着剤層の硬化物が回
路基板と接着している接続構造体。 - 【請求項9】 回路基板がポリエステルベースの回路基
板である請求項8記載の接続構造体。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000050180A JP3491595B2 (ja) | 2000-02-25 | 2000-02-25 | 異方導電性接着フィルム |
US09/779,480 US6592783B2 (en) | 2000-02-25 | 2001-02-09 | Anisotropic conductive adhesive film |
TW090102862A TWI244497B (en) | 2000-02-25 | 2001-02-09 | Anisotropic conductive adhering film |
KR1020010008613A KR100639083B1 (ko) | 2000-02-25 | 2001-02-21 | 이방도전성 접착필름 |
CNB011123745A CN1190801C (zh) | 2000-02-25 | 2001-02-24 | 各向异性导电性粘结膜 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000050180A JP3491595B2 (ja) | 2000-02-25 | 2000-02-25 | 異方導電性接着フィルム |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2001240816A true JP2001240816A (ja) | 2001-09-04 |
JP3491595B2 JP3491595B2 (ja) | 2004-01-26 |
Family
ID=18571998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2000050180A Expired - Lifetime JP3491595B2 (ja) | 2000-02-25 | 2000-02-25 | 異方導電性接着フィルム |
Country Status (5)
Country | Link |
---|---|
US (1) | US6592783B2 (ja) |
JP (1) | JP3491595B2 (ja) |
KR (1) | KR100639083B1 (ja) |
CN (1) | CN1190801C (ja) |
TW (1) | TWI244497B (ja) |
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- 2001-02-09 US US09/779,480 patent/US6592783B2/en not_active Expired - Lifetime
- 2001-02-09 TW TW090102862A patent/TWI244497B/zh not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
KR100639083B1 (ko) | 2006-10-27 |
CN1311511A (zh) | 2001-09-05 |
TWI244497B (en) | 2005-12-01 |
US20030102466A1 (en) | 2003-06-05 |
CN1190801C (zh) | 2005-02-23 |
JP3491595B2 (ja) | 2004-01-26 |
US6592783B2 (en) | 2003-07-15 |
KR20010085434A (ko) | 2001-09-07 |
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