JP5192194B2 - 接着フィルム - Google Patents
接着フィルム Download PDFInfo
- Publication number
- JP5192194B2 JP5192194B2 JP2007194702A JP2007194702A JP5192194B2 JP 5192194 B2 JP5192194 B2 JP 5192194B2 JP 2007194702 A JP2007194702 A JP 2007194702A JP 2007194702 A JP2007194702 A JP 2007194702A JP 5192194 B2 JP5192194 B2 JP 5192194B2
- Authority
- JP
- Japan
- Prior art keywords
- adhesive layer
- adhesive
- resin component
- glass transition
- temperature
- 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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- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
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- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
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- 239000011118 polyvinyl acetate Substances 0.000 description 1
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- 150000003573 thiols Chemical class 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/321—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives
- H05K3/323—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives by applying an anisotropic conductive adhesive layer over an array of pads
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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
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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
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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
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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
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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
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- H01L24/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
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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
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Description
本発明は接着フィルムであって、前記第二の主樹脂成分のガラス転移温度は50℃以上110℃以下である接着フィルムである。
本発明は接着フィルムであって、前記第一の接着剤層の前記反応ピーク温度と、前記第二の接着剤層の前記反応ピーク温度との差は、10℃以下にされた接着フィルムである。
本発明は、互いに密着され、副樹脂成分が含有された第一、第二の接着剤層を有する接着フィルムの、前記第一の接着剤層は、前記副樹脂成分のガラス転移温度と、前記第一の接着剤層の反応ピーク温度と前記第二の接着剤層の反応ピーク温度とよりも高いガラス転移温度を有する第一の主樹脂成分を含有させ、導電性粒子を分散させて形成し、前記第二の接着剤層は、前記副樹脂成分のガラス転移温度よりも高く、前記第一の主樹脂成分のガラス転移温度と前記第一の接着剤層の反応ピーク温度と前記第二の接着剤層の反応ピーク温度とよりも低いガラス転移温度を有する第二の主樹脂成分を含有させて形成し、第一の端子が配置された基板の一面と前記第一の接着剤層とを密着させ、第二の端子が配置された電気部品の一面と前記第二の接着剤層とを密着させて、前記基板と前記電気部品とを仮固定し、前記第一、第二の接着剤層を昇温させ、前記第二の主樹脂成分のガラス転移温度にして前記第二の接着剤層を溶融させ、隣接する前記第二の端子の間に前記第二の接着剤層を流し込んだ後、前記第一、第二の接着剤層を昇温させ、前記第一、第二の接着剤層中の前記副樹脂成分を反応させて前記第一、第二の接着剤層を硬化させ、前記第一の端子と、前記第二の端子とを、前記導電性粒子で電気的に接続しながら前記基板と前記電気部品とを固定する接続方法であって、前記導電性粒子は、前記第二の接着剤層には分散させず、又は、前記第二の接着剤層よりも前記第一の接着剤層の方が密度が高くなるように分散させ、前記第一の接着剤層の膜厚を、前記導電性粒子の平均粒径の0.5倍以上2.0倍以下にする接続方法である。
本発明は、接続方法であって、前記第二の主樹脂成分のガラス転移温度を50℃以上110℃以下の温度にする接続方法である。
本発明は、接続方法であって、前記第一の接着剤層の前記反応ピーク温度と、前記第二の接着剤層の前記反応ピーク温度との差を10℃以下にする接続方法である。
本発明は、上記いずれかの接続方法で接続された前記基板と前記電気部品とを有する接続体である。
また、第二の主樹脂成分は、原料として溶剤に混合される前も、混合、乾燥後に、第二の接着剤層に含有された状態でも、ガラス転移温度が、第一の主樹脂成分のガラス転移温度よりも低く、かつ、第一、第二の接着剤層の反応ピーク温度よりも低いままである。
副樹脂成分と、第一の主樹脂成分よりもガラス転移温度が低い第二の主樹脂成分と、カップリング剤や硬化剤等の添加剤と、溶剤とを混合して第二の原料液を作成する。
第二の接着剤層12中には導電性粒子15が分散されておらず、分散されていたとしても、その粒子密度は第一の接着剤層11よりも小さい。
第二の接着剤層12に剥離フィルム22が密着している場合は、仮貼り前、又は仮貼り後に、剥離フィルム22を剥離し、第二の接着剤層12表面を露出させる。
押し退けられた第二の接着剤層12が隣接する第二の端子45間に流れ込むが、第二の接着剤層12には導電性粒子が分散されていないから、隣接する第二の端子45間は短絡しない。
各溶解液に、副樹脂成分と、導電性粒子と、カップリング剤とを、下記表1に記載する配合比率(重量比)になるよう混合して、第一、第二の原料液を4種類ずつ作成した。
第一、第二の接着剤層A1〜A4、N1〜N4の原料液に用いた固形成分の配合比率を下記表1に記載する。
副樹脂成分は、ジャパンエポキシレジン(株)社製の商品名「EP828」(ビスフェノールA型液状エポキシ樹脂)であり、常温で液状の熱硬化性樹脂である。
主樹脂成分のうち、商品名「YP70」はTg84℃、分子量5.5万の東都化成社製のフェノキシ樹脂であり、商品名「YDF2001」はTg54℃の東都化成社製の固形ビスF型エポキシ樹脂であり、商品名「FX293」はTg163℃、分子量4.5万の東都化成社製のフェノキ樹脂であり、商品名「EP4250」はTg108℃、分子量6万のジャパンエポキシレジン(株)社製のフェノキシ樹脂であり、商品名「SG708−6T」はTg−8℃、分子量50万、固形分15%(トルエン/酢酸エチル=1/1)のナガセケムテック(株)社製のアクリルゴムである。
商品名「KBE403」は信越化学工業(株)社製のエポキシシランである。
商品名「AUL704」は積水化学工業(株)社製のNi/Auメッキ樹脂粒子(平均粒径4μm)である。
評価基材として評価試験用のICチップ(材質:シリコン、平面積1.8mm×20mm、厚さ:0.5mm、金バンプ、バンプ高さ:15μm、バンプ面積:20μm×85μm、バンプ間スペース10μm、バンプ中心間距離(ピッチ):30μm)と、評価試験用のITOパターンガラス(基板本体:コーニング社の製品名「1737F」、ガラスサイズ:50mm×30mm×0.7mm、ITOパッド(端子)サイズ20μm×85μm、パッド中心間距離(ピッチ):30μm)を用意した。
次いで、本圧着装置(ツールサイズ30mm×50mm)、膜厚50μmのテフロン(登録商標である)緩衝材を挟んでICチップに押し当て、加熱押圧し、7種類の接続体を得た(本圧着)。本圧着条件は本圧着装置の温度が190℃、本圧着装置からの押圧力が3MPaで10秒間行った。
上記実装工程で、仮固定後にICチップの1つのバンプの下方にある導電性粒子の数と、本圧着後にICチップの1つのバンプと、ITOパターンガラスの1つのITOパッドとで挟まれた導電性粒子の数(粒子捕捉数)を測定した。
測定は100個のバンプについて測定し、粒子捕捉数の最大値と、最小値と、平均値と、捕捉効率(単位:%)を下記表3に記載する。
捕捉効率(%)=(本圧着後の粒子捕捉数)/(仮固定後にバンプ下に存在する粒子数)×100……式(1)
本圧着後、対向する1つのバンプと、1つの端子との間の導通抵抗を測定した。測定は100箇所について行い、導通抵抗の最小値と、最大値と、平均値を上記表3に記載した。
上記表3から明らかなように、実施例Y1〜Y3は比較例X1〜X4に比べて粒子捕捉数が多く、導通抵抗も低い傾向があり、本発明の接着フィルム10を電気部品の接続に用いれば、接続信頼性が向上することが確認された。
ICチップのバンプと、ITOパターンガラスの配線(ITOパッド)とが、横方向に7mmずれるようにミスアライメントを行った以外は、上記「実装工程」で記載した条件で、ICチップをITOパターンガラスに接続し、接続体を作成した。
実施例Y1〜Y3、比較例X1〜X4の接着フィルム10を、それぞれ幅1.5mm、長さ100mに切り出したものをリールに巻き取り、ブロッキングが発生しないか確認をおこなった。尚、接着フィルム10は片面に剥離フィルムを貼付した状態でリールに巻き取った。
第一、第二の主樹脂成分は、シート状にする為の膜成分として重要な役割を果たす。第一、第二の主樹脂成分としては、ガラス転移温度以上に昇温すると固体から液体になり、ガラス転移温度未満に冷却されると液体から固体に戻る樹脂であれば、特に限定されず、例えば、フェノキシ樹脂、ポリウレタン樹脂、飽和ポリエステル、アクリルゴム、NBRゴム、ポリプタジエンゴム、ポリスチレン、ポリエチレン、ポリ酢酸ビニルやそれら共重合体などを用いる。これらの樹脂は熱可塑性樹脂である。
液状樹脂は、ガラス転移温度が常温よりも低く、常温では液体であるが、常温よりも高い所定の硬化温度以上に加熱されると重合する。その重合物は常温では固体である。
第一、第二の接着剤層中での副樹脂成分の重合反応を促進させるために、第一、第二の原料液にはそれぞれ硬化剤を含有させることが望ましい。
第一の接着剤層に含有させる導電性粒子は特に限定されず、一般に使用される導電性粒子を広く用いることができる。
第一の接着剤層11の反応ピーク温度(第一の反応ピーク温度)と、第二の接着剤層の反応ピーク温度(第二の反応ピーク温度)は、それぞれ60℃以上140℃以下の温度範囲にあることが好ましい。
これに対し第二の主樹脂成分としては、ガラス転移温度が、第一の主樹脂成分のガラス転移温度よりも低く、かつ、第一、第二の反応ピーク温度よりも低いものを用いる。
基板3はガラス基板に限定されず、リジッド基板、フレキシブル配線板等を用いることができる。
Claims (7)
- 互いに密着された第一、第二の接着剤層と、導電性粒子とを有し、
前記第一、第二の接着剤層はそれぞれ副樹脂成分を含有し、前記第一、第二の接着剤層を昇温させると、前記第一、第二の接着剤層中の前記副樹脂成分が反応し、前記第一、第二の接着剤層が硬化する接着フィルムであって、
前記第一の接着剤層には、前記副樹脂成分よりもガラス転移温度が高い第一の主樹脂成分が含有され、
前記第二の接着剤層には、前記副樹脂成分よりもガラス転移温度が高く、かつ、前記第一の主樹脂成分よりもガラス転移温度が低い第二の主樹脂成分が含有され、
前記第一、第二の接着剤層の昇温中に、前記第一、第二の接着剤層の発熱量が最大となる反応ピーク温度は、前記第一の主樹脂成分のガラス転移温度よりも低く、かつ、前記第二の主樹脂成分のガラス転移温度よりも高くされ、
前記導電性粒子は、前記第二の接着剤層には分散されずに前記第一の接着剤層中に分散されているか、又は、前記第二の接着剤層よりも前記第一の接着剤層の方が密度が高く分散され、
前記第一の接着剤層の膜厚は、前記導電性粒子の平均粒径の0.5倍以上2.0倍以下にされた接着フィルム。 - 前記第二の主樹脂成分のガラス転移温度は50℃以上110℃以下である請求項1記載の接着フィルム。
- 前記第一の接着剤層の前記反応ピーク温度と、前記第二の接着剤層の前記反応ピーク温度との差は、10℃以下にされた請求項1又は請求項2のいずれか1項記載の接着フィルム。
- 互いに密着され、副樹脂成分が含有された第一、第二の接着剤層を有する接着フィルムの、前記第一の接着剤層は、前記副樹脂成分のガラス転移温度と、前記第一の接着剤層の反応ピーク温度と前記第二の接着剤層の反応ピーク温度とよりも高いガラス転移温度を有する第一の主樹脂成分を含有させ、導電性粒子を分散させて形成し、
前記第二の接着剤層は、前記副樹脂成分のガラス転移温度よりも高く、前記第一の主樹脂成分のガラス転移温度と前記第一の接着剤層の反応ピーク温度と前記第二の接着剤層の反応ピーク温度とよりも低いガラス転移温度を有する第二の主樹脂成分を含有させて形成し、
第一の端子が配置された基板の一面と前記第一の接着剤層とを密着させ、第二の端子が配置された電気部品の一面と前記第二の接着剤層とを密着させて、前記基板と前記電気部品とを仮固定し、
前記第一、第二の接着剤層を昇温させ、前記第二の主樹脂成分のガラス転移温度にして前記第二の接着剤層を溶融させ、隣接する前記第二の端子の間に前記第二の接着剤層を流し込んだ後、前記第一、第二の接着剤層を昇温させ、前記第一、第二の接着剤層中の前記副樹脂成分を反応させて前記第一、第二の接着剤層を硬化させ、前記第一の端子と、前記第二の端子とを、前記導電性粒子で電気的に接続しながら前記基板と前記電気部品とを固定する接続方法であって、
前記導電性粒子は、前記第二の接着剤層には分散させず、又は、前記第二の接着剤層よりも前記第一の接着剤層の方が密度が高くなるように分散させ、
前記第一の接着剤層の膜厚を、前記導電性粒子の平均粒径の0.5倍以上2.0倍以下にする接続方法。 - 前記第二の主樹脂成分のガラス転移温度を50℃以上110℃以下の温度にする請求項4記載の接続方法。
- 前記第一の接着剤層の前記反応ピーク温度と、前記第二の接着剤層の前記反応ピーク温度との差を10℃以下にする請求項4又は請求項5のいずれか1項記載の接続方法。
- 請求項4乃至請求項6のいずれか1項記載の接続方法で接続された前記基板と前記電気部品とを有する接続体。
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PCT/JP2008/061521 WO2009013968A1 (ja) | 2007-07-26 | 2008-06-25 | 接着フィルム、接続方法及び接合体 |
KR1020107002334A KR101150613B1 (ko) | 2007-07-26 | 2008-06-25 | 접착 필름, 접속 방법 및 접합체 |
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TW097124788A TWI375967B (en) | 2007-07-26 | 2008-07-01 | Adhesive film, connecting method, and connected structure |
US12/689,308 US8158887B2 (en) | 2007-07-26 | 2010-01-19 | Adhesive film, connecting method, and joined structure |
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