JP3871083B2 - Film adhesive and circuit board manufacturing method - Google Patents
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- JP3871083B2 JP3871083B2 JP07822497A JP7822497A JP3871083B2 JP 3871083 B2 JP3871083 B2 JP 3871083B2 JP 07822497 A JP07822497 A JP 07822497A JP 7822497 A JP7822497 A JP 7822497A JP 3871083 B2 JP3871083 B2 JP 3871083B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、例えば液晶パネル等において、２つの回路基板同士の電極間に形成し、両電極を接続するのに良好なフィルム状接着剤に関するものである。
【０００２】
【従来の技術】
２つの回路基板同士を接着すると共に、これらの電極間に電気的導通を得る回路接続部材として、スチレン系やポリエステル系等の熱可塑性物質や、エポキシ系やシリコーン系等の熱硬化性物質と導電粒子からなるフィルム状接着剤が一般に知られている。
【０００３】
【発明が解決しようとする課題】
このフィルム状接着剤を用いて接合する時に、接合する電子部品を高温にさらさないためできるだけ低温で接合する必要がある。また、生産性を向上するため短時間での接合の要求がある。このような接合の低温化、短時間化をするためには、より反応性の高い熱硬化性樹脂、硬化剤を適用しなくてはならない。しかし、硬化性物質と硬化剤は同一の系に含まれているため、反応性が高くなるほど硬化性物質と硬化剤は反応しやすくなり、可使時間が短くなるので反応性を高めるには限度がある。このためマイクロカプセル等で潜在性を付与した硬化剤を用いることで可使時間を延ばす等の工夫が必要であるが、マイクロカプセル等で潜在性を付与した硬化剤を用いた場合でもエポキシの反応性が非常に高い場合は可使時間が短くなるため反応性を高めるにはやはり限度がある。
本発明は、従来より高い反応性を持ち、かつ従来と同等の可使時間をもつフィルム状接着剤を提供するものである。
【０００４】
【課題を解決するための手段】
本発明のフィルム状接着剤は、エポキシ樹脂（Ａ）とエポキシ樹脂硬化剤を含む第１の接着剤層と、エポキシ樹脂（Ｂ）を含む第２の接着剤層との２層を備え、エポキシ樹脂（Ａ）はエポキシ樹脂（Ｂ）よりゲルタイムが長いもので、第２の接着剤層にはエポキシ樹脂硬化剤が混入されていないか第１の接着剤層より混入量が少ないことを特徴とするものである。
接着剤層の少なくとも１層に導電性粒子を混入し異方導電性を示すようにすることができる。
導電性粒子としては、平均粒径が２〜１８μｍのものが使用でき、導電性粒子の含有量は接着剤樹脂組成物１００部（体積）に対して、０．１から２０部（体積）が好ましい。
本発明の回路板の製造法は、第一の接続端子を有する第一の回路部材と、第二の接続端子を有する第二の回路部材とを、第一の接続端子と第二の接続端子を対向して配置し、前記対向配置した第一の接続端子と第二の接続端子の間に本発明のフィルム状接着剤を介在させ、加熱加圧して前記対向配置した第一の接続端子と第二の接続端子を電気的に接続させるものである。
【０００５】
【発明の実施の形態】
本発明に用いるエポキシ樹脂について説明する。エポキシ樹脂は、エピクロルヒドリンとビスフェノールＡやＦ、ＡＤ等から誘導されるビスフェノール型エポキシ樹脂、エピクロルヒドリンとフェノールノボラックやクレゾールノボラックから誘導されるエポキシノボラック樹脂やナフタレン環を含んだ骨格を有するナフタレン系エポキシ樹脂、グリシジルアミン、グリシジルエーテル、ビフェニル、脂環式等の１分子内に２個以上のグリシジル基を有する各種のエポキシ化合物等を単独にあるいは２種以上を混合して用いることが可能である。これらのエポキシ樹脂は、不純物イオン（Ｎａ＋、Ｃｌ−等）や、加水分解性塩素等を３００ｐｐｍ以下に低減した高純度品を用いることがエレクトロンマイグレーション防止のために好ましい。
【０００６】
エポキシ樹脂硬化剤としてはポリアミン類、ポリメルカプタン、ポリフェノール、酸無水物等の重付加型硬化剤、また触媒型硬化剤としてはイミダゾール系、ヒドラジド系、三フッ化ホウ素−アミン錯体、スルホニウム塩、アミンイミド、ジアミノマレオニトリル、メラミン及びその誘導体、ポリアミンの塩、ジシアンジアミド等、及びこれらの変性物があり、これらは単独あるいは２種以上の混合体として使用できる。触媒型硬化剤はアニオン又はカチオン重合性のものがあり、速硬化性を得やすく、また化学等量的な考慮が少なくてよいことから好ましい。アニオン重合型の触媒型硬化剤としては、第３アミン類やイミダゾール類が主として用いられる。第３アミン類やイミダゾール類を配合したエポキシ樹脂は１６０〜２００℃程度の中温で、数１０秒〜数時間程度の加熱により硬化するために可使時間が比較的長い。
カチオン重合型の触媒型硬化剤としては、エネルギー線照射により樹脂を硬化させる感光性オニウム塩、例えば、芳香族ジアゾニウム塩、芳香族スルホニウム塩等が主として用いられる。またエネルギー線照射以外に、加熱によっても活性化してエポキシ樹脂を硬化させるものとして、脂肪族スルホニウム塩等がある。この種の硬化剤は速硬化性という特徴を有することから好ましい。
これらの硬化剤をポリウレタン系、ポリエステル系等の高分子物質や、Ｎｉ、Ｃｕ等の金属薄膜及びケイ酸カルシウム等の無機物で被覆してマイクロカプセル化したものは、可使時間が延長されるために好ましい。
【０００７】
ゲルタイムは硬化性樹脂がある硬化条件でゲル化するまでの時間であり、硬化性樹脂と硬化剤の反応性が高ければゲルタイムが短くなるので、硬化性樹脂と硬化剤の反応性の目安となる。硬化性樹脂と硬化剤の量、測定温度等でかなり値が変化するが、同一の測定条件でゲルタイムを測定するかぎりでは、硬化性樹脂と硬化剤の反応性の比較が可能である。ここではゲルタイムの測定の一例を示す。エポキシ樹脂１００重量部に対して触媒型硬化剤を５重量部配合し、これを１４０℃に温度調節された熱板に１００ｍｇ滴下してゲル化するまでの時間をゲルタイムとする。
【０００８】
導電性粒子としては、Ａｕ、Ａｇ、Ｎｉ、Ｃｕ、はんだ等の金属粒子やカーボン等があり、これら及び非導電性のガラス、セラミック、プラスチック等に前記した導通層を被覆等により形成したものでも良い。プラスチックを核とした場合や熱溶融金属粒子の場合、加熱加圧により変形性を有するので接続時に電極との接触面積が増加し信頼性が向上するので好ましい。導電性粒子は、接着剤樹脂成分１００部（体積）に対して０．１〜３０部（体積）の広範囲で用途により使い分ける。過剰な導電性粒子による回路の短絡等を防止するためには０．１〜２０部（体積）がより好ましい。
【０００９】
本発明で得た接続材料（フィルム状接着剤）を用いた電極の接続について説明する。この方法は、接着剤組成物（フィルム状接着剤）を、基板上の相対峙する電極間に形成し、加熱加圧により両電極の接触と基板間の接着を得る電極の接続方法である。電極を形成する基板としては、半導体、ガラス、セラミック等の無機質、ポリイミド、ポリカーボネート等の有機物、ガラス／エポキシ等のこれら複合の各組み合わせが適用できる。
【００１０】
また本発明の接続材料（フィルム状接着剤）は、例えばフェイスダウン方式により半導体チップを基板と接着フィルムで接着固定すると共に両者の電極どうしを電気的に接続する場合にも使用できる。
すなわち、第一の接続端子を有する第一の回路部材と、第二の接続端子を有する第二の回路部材とを、第一の接続端子と第二の接続端子を対向して配置し、前記対向配置した第一の接続端子と第二の接続端子の間に本発明の接続材料（フィルム状接着剤）を介在させ、加熱加圧して前記対向配置した第一の接続端子と第二の接続端子を電気的に接続させ回路板を製造することができる。
【００１１】
このような回路部材としては半導体チップ、抵抗体チップ、コンデンサチップ等のチップ部品、プリント基板等の基板等が用いられる。
これらの回路部材には接続端子が通常は多数（場合によっては単数でも良い）設けられており、前記回路部材の少なくとも１組をそれらの回路部材に設けられた接続端子の少なくとも一部を対向配置し、対向配置した接続端子間に接着剤を介在させ、加熱加圧して対向配置した接続端子どうしを電気的に接続して回路板とする。
回路部材の少なくとも１組を加熱加圧することにより、対向配置した接続端子どうしは、直接接触により又は異方導電性接着剤の導電粒子を介して電気的に接続することができる。
【００１２】
本発明においては、反応性の高いエポキシ樹脂（Ｂ）を含む接着剤層のエポキシ樹脂硬化剤の量を、系の反応性を考慮せずに必要な可使時間に応じて適宜調節できる。
このフィルム状接着剤を用いて電子部品を接合する際に加熱加圧をするため、エポキシ樹脂（Ｂ）を含む接着剤層とエポキシ樹脂硬化剤を含まない接着剤層、エポキシ樹脂（Ａ）及びエポキシ樹脂硬化剤を含む接着剤層は溶融し、互いに混合する。エポキシ樹脂（Ａ）を含む層がエポキシ樹脂硬化剤を含まない接着剤層、エポキシ樹脂（Ｂ）を含む層と混合することを考えて、あらかじめエポキシ樹脂硬化剤の量を増量しておけば、エポキシ樹脂（Ｂ）が反応するに充分なエポキシ樹脂硬化剤量が供給されるため、高い反応性を得ることができる。
【００１３】
【実施例】
実施例１
ビスフェノールAとエピクロルヒドリンから、ビスフェノールA型フェノキシ樹脂（平均分子量２００００）６０ｇを一般的方法により作製し、これを重量比でトルエン（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％の溶液とした。
ビスフェノールＡ型液状エポキシ樹脂（油化シェルエポキシ株式会社製、商品名エピコート８２８）５０部（重量部、以下同じ）、ビスフェノールＡ型フェノキシ樹脂５０部、及びカチオン性熱重合開始剤（三新化学株式会社製、商品名サンエイドＳＩ６０を用いた）７．５部を配合し、さらに、導電性粒子を３部（体積、接着剤樹脂組成物１００部（体積）に対して）配合分散させ、厚み８０μｍのフッ素樹脂フィルムに塗工装置を用いて塗布し、７５℃、１０分の熱風乾燥により接着剤層の厚みが９μｍの導電性接着剤層１を得た。
エポキシ化ポリブタジエン樹脂（ダイセル化学工業株式会社製、商品名エポリードＰＢ４７００−０２）５０部、ビスフェノールＡ型フェノキシ樹脂５０部を配合し、さらに導電性粒子を３部（体積、接着剤樹脂組成物１００部（体積）に対して）配合分散させ、厚み８０μｍのフッ素樹脂フィルムに塗工装置を用いて塗布し、７５℃、１０分の熱風乾燥により接着剤層の厚みが９μｍの導電性接着剤層２を得た。
導電性接着剤層１と導電性接着剤層２を４０℃に加熱しながらロールラミネーターでラミネートすることで接着剤層の厚みが１８μｍのフィルム状接着剤を得た。
【００１４】
実施例２
導電性接着剤層１の厚みが１７μｍで導電性接着剤層２の厚みが１μｍとした他は、実施例１と同様にしてフィルム状接着剤を得た。
【００１５】
実施例３
導電性接着剤層１に配合するカチオン性熱重合開始剤の量を２０部、厚みを１μｍとし、導電性接着剤層２の厚みを１７μｍとした他は、実施例１と同様にしてフィルム状接着剤を得た。
【００１６】
実施例４
導電性接着剤層１の厚みが３３μｍで導電性接着剤層２の厚みが２μｍとした他は、実施例１と同様にしてフィルム状接着剤を得た。
【００１７】
実施例５
導電性接着剤層１に配合するカチオン性熱重合開始剤の量を２０部、厚みを２μｍとし、導電性接着剤層２の厚みを３３μｍとした他は、実施例１と同様にしてフィルム状接着剤を得た。
【００１８】
実施例６
導電性接着剤層２にカチオン性熱重合開始剤を２．５部配合した以外は実施例１と同様にしてフィルム状接着剤を得た。
【００１９】
実施例７
導電性接着剤層２に含まれるエポキシ化ポリブタジエン樹脂に代えてナフタレン系エポキシ樹脂（ナフタレンジオール系エポキシ樹脂、大日本インキ化学工業株式会社製、商品名ＨＰ−４０３２）とした他は、実施例１と同様にしてフィルム状接着剤を得た。
【００２０】
実施例８
導電性接着剤層１に配合される樹脂をビスフェノールＡ型フェノキシ樹脂１００部とし、含まれるカチオン性熱重合開始剤に代えてアニオン性熱重合開始剤
（イミダゾール、関東化学株式会社製）とした他は実施例１と同様にしてフィルム状接着剤を得た。
以上、実施例１で用いたエポキシ樹脂とカチオン性熱重合開始剤のゲルタイムを表１に示す。
【００２１】
比較例１
エポキシ化ポリブタジエン樹脂（ダイセル化学工業株式会社製、商品名エポリードＰＢ４７００）２５部、ビスフェノールＡ型液状エポキシ樹脂（油化シェルエポキシ株式会社製、商品名エピコート８２８）２５部及び、ビスフェノールＡ型フェノキシ樹脂５０部及び、カチオン性熱重合開始剤（三新化学株式会社製、商品名サンエイドＳＩ６０を用いた）５部を配合しさらに、導電性粒子を３体積％配合分散させ、厚み８０μｍのフッ素樹脂フィルムに塗工装置を用いて塗布し、７５℃、１０分の熱風乾燥により接着剤層の厚みが１８μｍのフィルム状接着剤を得た。
【００２３】
比較例２
導電性接着剤層１に含まれるカチオン性熱重合開始剤を２．５部とした以外は実施例１と同様にしてフィルム状接着剤を得た。
【００２４】
比較例３
導電性接着剤層２にカチオン性熱重合開始剤を５部配合した以外は実施例１と同様にしてフィルム状接着剤を得た。
【００２５】
回路の接続
上述のフィルム状接着剤を用いて、ライン幅５０μｍ、ピッチ１００μｍ、厚み１８μｍの銅回路を５００本有するフレキシブル回路板（ＦＰＣ）同士を１５０℃、３ＭＰａで２０秒間加熱加圧して、幅２ｍｍにわたり接続した。この時、予め一方のＦＰＣ上に、フィルム状接着剤の接着面を貼付けた後、７０℃、０．５ＭＰａで５秒間加熱加圧して仮接続し、その後、フッ素樹脂フィルムを剥離してもう一方のＦＰＣと接続した。
また、前述のＦＰＣと酸化インジウム（ＩＴＯ）の薄層を形成したガラス（表面抵抗２０Ω／口）とを１７０℃、３ＭＰａで２０秒間加熱加圧して、幅２ｍｍにわたり接続した。この時、上記と同様にＩＴＯガラスに仮接続を行った。
【００２６】
接続抵抗の測定
回路の接続後、上記接続部を含むＦＰＣの隣接回路間の抵抗値を、初期と、８５℃、８５％ＲＨの恒温恒湿槽中に５００時間保持した後に、マルチメータで測定した。抵抗値は隣接回路間の抵抗１５０点の平均（ｘ＋３σ）で示した。
【００２７】
接続部の接着力の測定
ＦＰＣに用いられている接着剤と各接着剤組成物との接着性は１ｃｍ当りの接着力をＪＩＳ−ｚ０２３７に準じて９０度剥離法で測定し評価した。使用したＦＰＣは＃７１００（東レ株式会社性、商品名）を接着剤として用いて作成した。そしてこのＦＰＣを用いて、それぞれ回路接続隊を作製して測定を行なった。測定装置は東洋ボールドウィン株式会社製テンシロンＵＴＭ−４（剥離速度５０ｍｍ／ｍｉｎ、２５℃）を使用した。これらの結果を表２に示した。
接続部の接着力の測定ＦＰＣに用いられている接着剤と各接着剤組成物との接着性は１ｃｍ当りの接着力をＪＩＳ−ｚ０２３７に準じて９０度剥離法で測定し評価した。使用したＦＰＣは＃７１００（東レ株式会社性、商品名）を接着剤として用いて作成した。そしてこのＦＰＣを用いて、それぞれ回路接続隊を作製して測定を行なった。測定装置は東洋ボールドウィン株式会社製テンシロンＵＴＭ−４（剥離速度５０ｍｍ／ｍｉｎ、２５℃）を使用した。
これらの結果を表２に示した。
【００２８】
ビスフェノール−Ａ型エポキシ樹脂に比べてゲルタイムの短いエポキシ樹脂であるナフタレン型エポキシ樹脂、エポキシ化ポリブタジエンがエポキシ樹脂硬化剤が含まれない層にある実施例１から５及び、７、８では良好な可使時間を得られた。また、ナフタレン型エポキシ樹脂、エポキシ化ポリブタジエンが含まれる層にエポキシ樹脂硬化剤があってもその量が少なければ、若干可使時間は短くなるが、実用にたえうる可使時間が得られた。しかし、ナフタレン型エポキシ樹脂、エポキシ化ポリブタジエンが含まれる層にエポキシ樹脂硬化剤が含まれる量が２．５部より多いと比較例１、３のように可使時間が極端に短くなる。
【００２９】
【発明の効果】
以上詳述したように本発明によれば、高反応で且つ可使時間の長いフィルム状接着剤を提供することが可能となった。
また本発明により、信頼性に優れる回路板の製造が可能になった。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a film-like adhesive that is formed between electrodes of two circuit boards in a liquid crystal panel or the like and is good for connecting both electrodes.
[0002]
[Prior art]
As a circuit connecting member that bonds two circuit boards together and obtains electrical continuity between these electrodes, it conducts with thermoplastic materials such as styrene and polyester, and thermosetting materials such as epoxy and silicone. Film adhesives composed of particles are generally known.
[0003]
[Problems to be solved by the invention]
When joining using this film adhesive, it is necessary to join at as low a temperature as possible so that the electronic components to be joined are not exposed to high temperatures. In addition, there is a demand for bonding in a short time in order to improve productivity. In order to lower the temperature and shorten the time for such bonding, a more reactive thermosetting resin and curing agent must be applied. However, since the curable substance and the curing agent are contained in the same system, the higher the reactivity, the more easily the curable substance and the curing agent react, and the pot life is shortened. There is. For this reason, it is necessary to devise measures such as extending the pot life by using a curing agent imparted with latency by microcapsules, etc., but even when using a curing agent imparted latency by microcapsules or the like, the reaction of epoxy If the potency is very high, the pot life is shortened, so there is still a limit to increasing the reactivity.
The present invention provides a film adhesive having a higher reactivity than the prior art and having a pot life equivalent to that of the prior art.
[0004]
[Means for Solving the Problems]
The film adhesive of the present invention comprises two layers, a first adhesive layer containing an epoxy resin (A) and an epoxy resin curing agent, and a second adhesive layer containing an epoxy resin (B), and an epoxy. The resin (A) has a longer gel time than the epoxy resin (B), and the second adhesive layer is not mixed with an epoxy resin curing agent or is less mixed than the first adhesive layer. Is.
Conductive particles can be mixed in at least one layer of the adhesive layer to exhibit anisotropic conductivity.
As the conductive particles, particles having an average particle diameter of 2 to 18 μm can be used, and the content of the conductive particles is 0.1 to 20 parts (volume) with respect to 100 parts (volume) of the adhesive resin composition. preferable.
The method of manufacturing a circuit board according to the present invention includes a first circuit member having a first connection terminal and a second circuit member having a second connection terminal, the first connection terminal and the second connection terminal. Between the first connection terminal and the second connection terminal arranged opposite to each other, the film-like adhesive of the present invention is interposed between the first connection terminal and the first connection terminal arranged opposite to each other by heating and pressing. The second connection terminal is electrically connected.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The epoxy resin used in the present invention will be described. The epoxy resin is a bisphenol type epoxy resin derived from epichlorohydrin and bisphenol A, F, AD or the like, an epoxy novolac resin derived from epichlorohydrin and phenol novolak or cresol novolak, or a naphthalene type epoxy resin having a skeleton containing a naphthalene ring, Various epoxy compounds having two or more glycidyl groups in one molecule such as glycidylamine, glycidyl ether, biphenyl, and alicyclic can be used alone or in admixture of two or more. For these epoxy resins, it is preferable to use a high-purity product in which impurity ions (Na +, Cl-, etc.), hydrolyzable chlorine, etc. are reduced to 300 ppm or less to prevent electron migration.
[0006]
Epoxy resin curing agents include polyamines, polymercaptans, polyphenols, acid anhydrides and other polyaddition curing agents, and catalytic curing agents include imidazole, hydrazide, boron trifluoride-amine complexes, sulfonium salts, and amine imides. , Diaminomaleonitrile, melamine and derivatives thereof, polyamine salts, dicyandiamide, and the like, and modified products thereof, which can be used alone or as a mixture of two or more. Some of the catalyst-type curing agents are anionic or cationically polymerizable, which is preferable because it is easy to obtain fast curability and less chemical equivalent considerations are required. Tertiary amines and imidazoles are mainly used as anionic polymerization type catalyst type curing agents. Epoxy resins containing tertiary amines and imidazoles are cured at a medium temperature of about 160 to 200 ° C. by heating for about several tens of seconds to several hours, so that the pot life is relatively long.
As the cationic polymerization type catalyst-type curing agent, a photosensitive onium salt that cures the resin by energy ray irradiation, for example, an aromatic diazonium salt, an aromatic sulfonium salt, or the like is mainly used. In addition to irradiation with energy rays, aliphatic sulfonium salts and the like are also activated by heating to cure the epoxy resin. This type of curing agent is preferred because it has the property of fast curing.
Since these hardeners are coated with polymer materials such as polyurethane and polyester, metal thin films such as Ni and Cu, and inorganic materials such as calcium silicate, the pot life is extended. Is preferred.
[0007]
The gel time is the time until the curable resin gels under certain curing conditions, and the higher the reactivity between the curable resin and the curing agent, the shorter the gel time, which is a measure of the reactivity between the curable resin and the curing agent. . Although the value varies considerably depending on the amount of the curable resin and the curing agent, the measurement temperature, etc., the reactivity of the curable resin and the curing agent can be compared as long as the gel time is measured under the same measurement conditions. Here, an example of gel time measurement is shown. 5 parts by weight of a catalyst-type curing agent is blended with 100 parts by weight of the epoxy resin, and 100 mg of this is dripped onto a hot plate adjusted to 140 ° C. to form a gel time.
[0008]
Examples of the conductive particles include metal particles such as Au, Ag, Ni, Cu, and solder, carbon, and the like, and those in which the conductive layer described above is formed by coating or the like on non-conductive glass, ceramic, plastic, or the like. good. In the case of using plastic as a core or hot-melt metal particles, it is preferable because it has deformability by heating and pressurization, so that the contact area with the electrode is increased at the time of connection and reliability is improved. The conductive particles are properly used depending on the application in a wide range of 0.1 to 30 parts (volume) with respect to 100 parts (volume) of the adhesive resin component. In order to prevent a short circuit of the circuit due to excessive conductive particles, 0.1 to 20 parts (volume) is more preferable.
[0009]
The electrode connection using the connection material (film adhesive) obtained in the present invention will be described. This method is an electrode connection method in which an adhesive composition (film adhesive) is formed between opposing electrodes on a substrate and contact between both electrodes and adhesion between the substrates are obtained by heating and pressing. As the substrate for forming the electrodes, semiconductors, inorganic substances such as glass and ceramics, organic substances such as polyimide and polycarbonate, and combinations of these composites such as glass / epoxy can be applied.
[0010]
The connecting material (film adhesive) of the present invention can also be used when, for example, a semiconductor chip is bonded and fixed with a substrate and an adhesive film by a face-down method and the electrodes of both are electrically connected.
That is, the first circuit member having the first connection terminal and the second circuit member having the second connection terminal are disposed so that the first connection terminal and the second connection terminal face each other, The connection material (film adhesive) of the present invention is interposed between the first connection terminal and the second connection terminal that are arranged to face each other, and the first connection terminal and the second connection that are arranged to face each other by heating and pressing. A circuit board can be manufactured by electrically connecting terminals.
[0011]
As such a circuit member, a chip component such as a semiconductor chip, a resistor chip or a capacitor chip, a substrate such as a printed circuit board, or the like is used.
These circuit members are usually provided with a large number of connection terminals (or a single connection terminal in some cases), and at least one set of the circuit members is arranged so that at least a part of the connection terminals provided on the circuit members are opposed to each other. Then, an adhesive is interposed between the connection terminals arranged opposite to each other, and the connection terminals arranged opposite to each other by heating and pressing are electrically connected to form a circuit board.
By heating and pressurizing at least one set of circuit members, the connection terminals arranged opposite to each other can be electrically connected by direct contact or through conductive particles of an anisotropic conductive adhesive.
[0012]
In this invention, the quantity of the epoxy resin hardening | curing agent of the adhesive bond layer containing a highly reactive epoxy resin (B) can be suitably adjusted according to the required pot life, without considering the reactivity of a system.
An adhesive layer containing an epoxy resin (B), an adhesive layer not containing an epoxy resin curing agent, an epoxy resin (A), and an adhesive layer containing an epoxy resin (B) in order to heat and pressurize electronic parts using this film adhesive The adhesive layer containing the epoxy resin curing agent melts and mixes with each other. Considering that the layer containing the epoxy resin (A) is mixed with the adhesive layer not containing the epoxy resin curing agent and the layer containing the epoxy resin (B), if the amount of the epoxy resin curing agent is increased in advance, Since a sufficient amount of the epoxy resin curing agent for the reaction of the epoxy resin (B) is supplied, high reactivity can be obtained.
[0013]
【Example】
Example 1
From bisphenol A and epichlorohydrin, 60 g of bisphenol A type phenoxy resin (average molecular weight 20000) was prepared by a general method, and this was prepared by weight ratio of toluene (boiling point 110.6 ° C., SP value 8.90) / ethyl acetate (boiling point 77). .1 ° C., SP value 9.10) = dissolved in a 50/50 mixed solvent to obtain a solution having a solid content of 40%.
50 parts (parts by weight, the same applies hereinafter) of bisphenol A type liquid epoxy resin (trade name Epicoat 828, manufactured by Yuka Shell Epoxy Co., Ltd.), 50 parts of bisphenol A type phenoxy resin, and cationic thermal polymerization initiator (Sanshin Chemical Co., Ltd.) 7.5 parts (made by company, using trade name Sun-Aid SI60) is blended, and further 3 parts (volume, 100 parts (volume) of adhesive resin composition) of conductive particles are blended and dispersed, and the thickness is 80 μm A conductive adhesive layer 1 having an adhesive layer thickness of 9 μm was obtained by drying with hot air at 75 ° C. for 10 minutes.
50 parts of epoxidized polybutadiene resin (manufactured by Daicel Chemical Industries, Ltd., trade name Epolide PB4700-02) and 50 parts of bisphenol A type phenoxy resin are added, and further 3 parts of conductive particles (volume, 100 parts of adhesive resin composition). Conductive adhesive layer 2 having an adhesive layer thickness of 9 μm by coating and dispersing on a fluororesin film having a thickness of 80 μm using a coating device and drying with hot air at 75 ° C. for 10 minutes. Got.
The conductive adhesive layer 1 and the conductive adhesive layer 2 were laminated with a roll laminator while being heated to 40 ° C. to obtain a film adhesive having a thickness of 18 μm.
[0014]
Example 2
A film adhesive was obtained in the same manner as in Example 1 except that the thickness of the conductive adhesive layer 1 was 17 μm and the thickness of the conductive adhesive layer 2 was 1 μm.
[0015]
Example 3
Except for the amount of the cationic thermal polymerization initiator compounded in the conductive adhesive layer 1 being 20 parts, the thickness being 1 μm, and the thickness of the conductive adhesive layer 2 being 17 μm, a film-like manner as in Example 1. An adhesive was obtained.
[0016]
Example 4
A film adhesive was obtained in the same manner as in Example 1 except that the thickness of the conductive adhesive layer 1 was 33 μm and the thickness of the conductive adhesive layer 2 was 2 μm.
[0017]
Example 5
Except for the amount of the cationic thermal polymerization initiator compounded in the conductive adhesive layer 1 being 20 parts, the thickness being 2 μm, and the thickness of the conductive adhesive layer 2 being 33 μm, a film-like manner as in Example 1 An adhesive was obtained.
[0018]
Example 6
A film adhesive was obtained in the same manner as in Example 1 except that 2.5 parts of a cationic thermal polymerization initiator was added to the conductive adhesive layer 2.
[0019]
Example 7
Example 1 except that the epoxidized polybutadiene resin contained in the conductive adhesive layer 2 was replaced with a naphthalene epoxy resin (naphthalene diol epoxy resin, trade name HP-4032, manufactured by Dainippon Ink & Chemicals, Inc.). In the same manner as above, a film adhesive was obtained.
[0020]
Example 8
The resin blended in the conductive adhesive layer 1 is 100 parts of bisphenol A type phenoxy resin, and an anionic thermal polymerization initiator (imidazole, manufactured by Kanto Chemical Co., Ltd.) is used instead of the cationic thermal polymerization initiator contained. Obtained a film adhesive in the same manner as in Example 1.
Table 1 shows the gel times of the epoxy resin and the cationic thermal polymerization initiator used in Example 1 above.
[0021]
Comparative Example 1
25 parts of epoxidized polybutadiene resin (Daicel Chemical Industries, Ltd., trade name Epolide PB4700), 25 parts of bisphenol A type liquid epoxy resin (trade name Epicoat 828, manufactured by Yuka Shell Epoxy Co., Ltd.) and 50 parts of bisphenol A phenoxy resin And 5 parts of a cationic thermal polymerization initiator (manufactured by Sanshin Chemical Co., Ltd., using trade name Sun-Aid SI60), and further 3% by volume of conductive particles are mixed and dispersed into a fluororesin film having a thickness of 80 μm. It applied using the coating apparatus and the film-form adhesive whose thickness of an adhesive bond layer is 18 micrometers was obtained by 75 degreeC and hot-air drying for 10 minutes.
[0023]
Comparative Example 2
A film adhesive was obtained in the same manner as in Example 1 except that the cationic thermal polymerization initiator contained in the conductive adhesive layer 1 was 2.5 parts.
[0024]
Comparative Example 3
A film adhesive was obtained in the same manner as in Example 1 except that 5 parts of a cationic thermal polymerization initiator was added to the conductive adhesive layer 2.
[0025]
Circuit connection Using the film adhesive described above, flexible circuit boards (FPC) having 500 copper circuits with a line width of 50 μm, a pitch of 100 μm, and a thickness of 18 μm are heated and pressed at 150 ° C. and 3 MPa for 20 seconds to obtain a width. Connected over 2 mm. At this time, after pasting the adhesive surface of the film adhesive on one FPC in advance, the film is temporarily connected by heating and pressing at 70 ° C. and 0.5 MPa for 5 seconds, and then the fluororesin film is peeled off and the other is removed. Connected to the FPC.
Further, the above-mentioned FPC and glass (surface resistance 20Ω / port) on which a thin layer of indium oxide (ITO) was formed were heated and pressurized at 170 ° C. and 3 MPa for 20 seconds to be connected over a width of 2 mm. At this time, temporary connection was made to ITO glass in the same manner as described above.
[0026]
After the connection resistance measurement circuit is connected, the resistance value between adjacent circuits of the FPC including the connection part is measured with a multimeter after being initially held in a constant temperature and humidity chamber at 85 ° C. and 85% RH for 500 hours. did. The resistance value is shown as an average (x + 3σ) of 150 resistances between adjacent circuits.
[0027]
Measurement of Adhesive Strength of Connection Portions The adhesiveness between the adhesive used in the FPC and each adhesive composition was evaluated by measuring the adhesive force per 1 cm by a 90-degree peeling method according to JIS-z0237. The FPC used was prepared using # 7100 (Toray Industries, trade name) as an adhesive. And using this FPC, a circuit connection unit was prepared and measured. As a measuring device, Tensilon UTM-4 (peeling speed 50 mm / min, 25 ° C.) manufactured by Toyo Baldwin Co., Ltd. was used. These results are shown in Table 2.
Measurement of Adhesive Strength of Connection Portions The adhesiveness between the adhesive used in the FPC and each adhesive composition was evaluated by measuring the adhesive force per 1 cm by a 90-degree peeling method according to JIS-z0237. The FPC used was prepared using # 7100 (Toray Industries, trade name) as an adhesive. And using this FPC, a circuit connection unit was prepared and measured. As a measuring device, Tensilon UTM-4 (peeling speed 50 mm / min, 25 ° C.) manufactured by Toyo Baldwin Co., Ltd. was used.
These results are shown in Table 2.
[0028]
Naphthalene type epoxy resin, which is an epoxy resin having a shorter gel time than bisphenol-A type epoxy resin, and Examples 1 to 5 and Examples 7 and 8 in which the epoxidized polybutadiene is in a layer not containing an epoxy resin curing agent I was able to get a working time. Also, even if there is an epoxy resin curing agent in the layer containing naphthalene type epoxy resin and epoxidized polybutadiene, if the amount is small, the pot life is slightly shortened, but the pot life that can be practically used is obtained. . However, when the amount of the epoxy resin curing agent contained in the layer containing the naphthalene type epoxy resin and the epoxidized polybutadiene is more than 2.5 parts, the pot life is extremely shortened as in Comparative Examples 1 and 3.
[0029]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to provide a film-like adhesive having a high response and a long pot life.
Further, the present invention makes it possible to manufacture a circuit board having excellent reliability.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07822497A JP3871083B2 (en) | 1997-03-28 | 1997-03-28 | Film adhesive and circuit board manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07822497A JP3871083B2 (en) | 1997-03-28 | 1997-03-28 | Film adhesive and circuit board manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10273628A JPH10273628A (en) | 1998-10-13 |
| JP3871083B2 true JP3871083B2 (en) | 2007-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07822497A Expired - Fee Related JP3871083B2 (en) | 1997-03-28 | 1997-03-28 | Film adhesive and circuit board manufacturing method |
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| JP (1) | JP3871083B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100483565B1 (en) * | 1999-02-08 | 2005-04-15 | 히다치 가세고교 가부시끼가이샤 | Circuit adhesive |
| JP2005330297A (en) * | 2003-06-20 | 2005-12-02 | Hitachi Chem Co Ltd | Method of forming adhesive material by adhesive material tape |
| JP5046581B2 (en) * | 2006-07-28 | 2012-10-10 | 旭化成イーマテリアルズ株式会社 | Adhesive for circuit connection |
| JP4872567B2 (en) * | 2006-09-26 | 2012-02-08 | 住友電気工業株式会社 | Wiring board connecting film and wiring board connecting method |
| JP5200744B2 (en) * | 2008-08-01 | 2013-06-05 | 住友電気工業株式会社 | Adhesive and electrode connection method using the same |
| JP5685473B2 (en) * | 2011-04-06 | 2015-03-18 | デクセリアルズ株式会社 | Anisotropic conductive film, method for manufacturing bonded body, and bonded body |
| JP5682720B2 (en) * | 2014-03-27 | 2015-03-11 | デクセリアルズ株式会社 | Anisotropic conductive adhesive film and manufacturing method thereof |
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1997
- 1997-03-28 JP JP07822497A patent/JP3871083B2/en not_active Expired - Fee Related
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| JPH10273628A (en) | 1998-10-13 |
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