JP5126233B2 - 接着剤組成物及びこれを用いた回路接続材料、並びに、回路部材の接続方法、回路接続体及び接着剤組成物の硬化物 - Google Patents
接着剤組成物及びこれを用いた回路接続材料、並びに、回路部材の接続方法、回路接続体及び接着剤組成物の硬化物 Download PDFInfo
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- JP5126233B2 JP5126233B2 JP2009536053A JP2009536053A JP5126233B2 JP 5126233 B2 JP5126233 B2 JP 5126233B2 JP 2009536053 A JP2009536053 A JP 2009536053A JP 2009536053 A JP2009536053 A JP 2009536053A JP 5126233 B2 JP5126233 B2 JP 5126233B2
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Classifications
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- H—ELECTRICITY
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- 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
-
- 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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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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
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
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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
まず、本実施形態に係る回路接続材料について説明する。図1は、本実施形態に係る回路接続材料5を示す断面図である。回路接続材料5は、フィルム状の基材6と、基材6の一方面上に設けられた接着剤層8とを備える。接着剤層8は、(a)エポキシ樹脂、(b)エポキシ樹脂硬化剤、及び(c)アクリル系共重合体を含む接着剤成分9と、接着剤成分9中に分散した導電粒子10Aとを含有する接着剤組成物からなる。
次に、接着剤成分9に含まれる(a)エポキシ樹脂、(b)エポキシ樹脂硬化剤、及び(c)アクリル系共重合体について説明する。
導電粒子10Aは、接着剤成分9中に分散している。導電粒子10Aとしては、例えばAu、Ag、Pt、Ni、Cu、W、Sb、Sn、はんだ等の金属やカーボンの粒子が挙げられる。導電粒子10Aの平均粒径は分散性、導電性の観点から1〜18μmであることが好ましい。
次に、回路接続材料5を用いて製造された回路接続体について説明する。図2は、回路電極同士が接続された回路接続体を示す概略断面図である。図2に示す回路接続体100は、相互に対向する第1の回路部材30及び第2の回路部材40を備えており、第1の回路部材30と第2の回路部材40との間には、これらを接続する接続部50aが設けられている。
次に、回路接続体100の製造方法について説明する。図3は、本発明に係る回路接続体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。本実施形態では、回路接続材料5の接着剤層8を熱硬化させ、最終的に回路接続体100を製造する。
導電性を有する核粒子を以下のようにして製造した。すなわち、基材粒子として架橋ポリスチレン粒子(総研化学製、商品名:SXシリーズ、平均粒径:4μm)を準備し、この粒子の表面上に、無電解めっき処理によってNi層(厚さ0.08μm)を設けた。更に、このNi層の外側に無電解めっき処理によってAu層(厚さ0.03μm)を設け、Ni層及びAu層からなる導電層を有する核粒子を得た。
上記のようにして製造した回路接続材料を用いてITO基板(厚さ0.7mm、表面抵抗<20Ω/□)とICチップ(厚さ0.55mm)とを接続し、回路接続体を形成した。ICチップは、バンプ面積2500μm2(50μm×50μm)、ピッチ100μm、高さ20μmの金バンプを備えるものを使用した。ITO基板は、厚さ1.1mmのガラス板の表面上にITOを蒸着により形成したものを使用した。
ICチップを実装した後のITO基板の反り量について、非接触式レーザー型3次元形状測定装置(キーエンス製、商品名:LT−9000)を用いて測定した。ICチップ側を下方に向け、ITO基板の裏面を上方に向けて回路接続体を平坦な台の上に置いた。そして、ITO基板の裏面の中心部と、このITO基板の裏面におけるICチップの両端から5mm離れた箇所との高さの差を測定した。この高さの差をガラス基板の反り量とした。
上記のようにして作製した回路接続体の接続部の初期抵抗を抵抗測定機(株式会社アドバンテスト製、商品名:デジタルマルチメータ)を用いて測定した。なお、測定は電極間に1mAの電流を流して行った。
回路接続体の接続部の接続信頼性について、温度サイクル試験を行うことによって評価した。温度サイクル試験は、回路接続体を温度サイクル槽(ETAC製、商品名:NT1020)内に収容し、室温から−40℃への降温、−40℃から100℃への昇温及び100℃から室温への降温の温度サイクルを500回繰り返すことによって行った。−40℃及び100℃における保持時間は、いずれも30分とした。温度サイクル試験後の接続部分の抵抗の測定は、初期抵抗の測定と同様に行った。
隣接する電極間の絶縁抵抗を抵抗測定機(株式会社アドバンテスト製、商品名:デジタルマルチメータ)を用い、以下の手順で測定した。まず、回路接続体の接続部に直流(DC)50Vの電圧を1分間印加した。そして、絶縁抵抗の測定は、電圧印加後の接続部に対し、2端子測定法によって行った。なお、上記の電圧の印加には、電圧計(株式会社アドバンテスト製、商品名:ULTRA HIGH RESISTANCE METER)を用いた。
本実施例で作製した二層構成の回路接続材料を200℃で1時間加熱して硬化させた。回路接続材料の硬化物から被測定試料(幅5mm、長さ20mm、膜厚25μm)を切り取り、次のようにして貯蔵弾性率及びガラス転移温度を測定した。すなわち、被測定試料の動的粘弾性について、動的粘弾性測定装置RASII(TAインスツルメント製)を用いて、昇温速度5℃/分、周波数10Hz、振幅3μm、引張モードの条件で測定した。そして、得られた結果から、−50℃及び100℃における貯蔵弾性率と、tanδの最大値(ガラス転移温度;Tg)を求めた。
重量平均分子量40×103のアクリル系共重合体の代わりに、表1の実施例2の欄に示すモノマー原料から製造した重量平均分子量50×103のアクリル系共重合体を使用したことの他は、実施例1と同様にして二層構成の回路接続材料及び回路接続体を作製した。
重量平均分子量40×103、ガラス転移温度−10℃のアクリル系共重合体の代わりに、表1の実施例3の欄に示すモノマー原料から製造した重量平均分子量70×103、ガラス転移温度−5℃のアクリル系共重合体を使用したことの他は、実施例1と同様にして二層構成の回路接続材料及び回路接続体を作製した。
重量平均分子量40×103、ガラス転移温度−10℃のアクリル系共重合体の代わりに、表1の実施例4の欄に示すモノマー原料から製造した重量平均分子量60×103、ガラス転移温度0℃のアクリル系共重合体を使用したことの他は、実施例1と同様にして二層構成の回路接続材料及び回路接続体を作製した。
重量平均分子量40×103、ガラス転移温度−10℃のアクリル系共重合体の代わりに、表1の実施例5の欄に示すモノマー原料から製造した重量平均分子量70×103、ガラス転移温度10℃のアクリル系共重合体を使用したことの他は、実施例1と同様にして二層構成の回路接続材料及び回路接続体を作製した。
二層構成の回路接続材料を作製する際に、各溶液に架橋反応性基を有するアクリル系共重合体を配合せず、表2に示す配合比率で導電粒子含有層及び導電粒子非含有層を形成したことの他は、実施例1と同様にして二層構成の回路接続材料及び回路接続材料を作製した。
Claims (17)
- 回路部材同士を接着するとともにそれぞれの回路部材が有する回路電極同士を電気的に接続するために用いられる接着剤組成物であって、
エポキシ樹脂と、
エポキシ樹脂硬化剤と、
架橋反応性基を有し且つ重量平均分子量が30000〜80000であるアクリル系共重合体と、
を含有し、
前記アクリル系共重合体は、原料に含まれるモノマー成分を共重合させることによって得られたものであり、当該原料に含まれるモノマー成分100質量部に対するグリシジルアクリレート及びグリシジルメタクリレートの合計量が1〜7質量部である接着剤組成物。 - 導電粒子を更に含有する、請求項1に記載の接着剤組成物。
- 前記アクリル系共重合体のガラス転移温度が−40〜40℃である、請求項1又は2に記載の接着剤組成物。
- 温度200℃で1時間加熱して得られる硬化物は、−50℃における貯蔵弾性率が2.0〜3.0GPaであり且つ100℃における貯蔵弾性率が1.0〜2.0GPaであるとともに、−50〜100℃の範囲における貯蔵弾性率の最大値と最小値との差が2.0GPa以下である、請求項1〜3のいずれか一項に記載の接着剤組成物。
- 温度200℃で1時間加熱して得られる硬化物は、ガラス転移温度が100〜150℃である、請求項1〜4のいずれか一項に記載の接着剤組成物。
- フィルム形成性高分子を更に含有する、請求項1〜5のいずれか一項に記載の接着剤組成物。
- ポリスチレン、ポリエチレン、ポリビニルブチラール、ポリビニルホルマール、ポリイミド、ポリアミド、ポリエステル、ポリ塩化ビニル、ポリフェニレンオキサイド、尿素樹脂、メラミン樹脂、フェノール樹脂、キシレン樹脂、ポリイソシアネート樹脂、フェノキシ樹脂、ポリイミド樹脂及びポリエステルウレタン樹脂からなる群から選ばれる少なくとも一種を更に含有する、請求項1〜5のいずれか一項に記載の接着剤組成物。
- COG実装又はCOF実装のために使用されるものである、請求項1〜7のいずれか一項に記載の接着剤組成物。
- フィルム状の基材と、
請求項1〜8のいずれか一項に記載の接着剤組成物からなり、前記基材の一方面上に設けられた接着剤層と、
を備える回路接続材料。 - 対向配置された一対の回路部材と、
請求項1〜8のいずれか一項に記載の接着剤組成物の硬化物からなり、前記一対の回路部材の間に介在しそれぞれの回路部材が有する回路電極同士が電気的に接続されるように当該回路部材同士を接着する接続部と、
を備える回路接続体。 - 前記一対の回路部材の少なくとも一方が、ICチップである、請求項10に記載の回路接続体。
- 前記一対の回路部材がそれぞれ有する回路電極の少なくとも一方の表面が、金、銀、錫、ルテニウム、ロジウム、パラジウム、オスミウム、イリジウム、白金及びインジウム錫酸化物から選ばれる少なくとも1種で構成されている、請求項10又は11に記載の回路接続体。
- 前記接続部に当接している前記一対の回路部材の当接面の少なくとも一方が、窒化シリコン、シリコーン化合物及び感光性もしくは非感光性ポリイミド樹脂から選ばれる少なくとも1種以上の素材によって構成される部分を有するものである、請求項10〜12のいずれか一項に記載の回路接続体。
- 前記硬化物は、エポキシ樹脂とアクリル系共重合体とが架橋した架橋構造を有する、請求項10〜13のいずれか一項に記載の回路接続体。
- 対向配置された一対の回路部材の間に請求項1〜8のいずれか一項に記載の接着剤組成物を介在させ、全体を加熱及び加圧して、前記接着剤組成物の硬化物からなり、前記一対の回路部材の間に介在しそれぞれの回路部材が有する回路電極同士が電気的に接続されるように前記回路部材同士を接着する接続部を形成することにより、前記一対の回路部材及び前記接続部を備える回路接続体を得る、回路部材の接続方法。
- 請求項1〜8のいずれか一項に記載の接着剤組成物を硬化させた硬化物。
- エポキシ樹脂とアクリル系共重合体とが架橋した架橋構造を有する、請求項16に記載の硬化物。
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Also Published As
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TW200932860A (en) | 2009-08-01 |
CN102876277B (zh) | 2014-12-10 |
JPWO2009044732A1 (ja) | 2011-02-10 |
CN102876277A (zh) | 2013-01-16 |
KR101376002B1 (ko) | 2014-03-19 |
KR20100009538A (ko) | 2010-01-27 |
KR20120073354A (ko) | 2012-07-04 |
JP2013058764A (ja) | 2013-03-28 |
WO2009044732A1 (ja) | 2009-04-09 |
CN101815769A (zh) | 2010-08-25 |
KR101403282B1 (ko) | 2014-06-02 |
CN101815769B (zh) | 2012-11-07 |
TWI394810B (zh) | 2013-05-01 |
CN102850982A (zh) | 2013-01-02 |
TW201309770A (zh) | 2013-03-01 |
KR20110066235A (ko) | 2011-06-16 |
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