JPH09504568A - 導電性接着剤 - Google Patents

導電性接着剤

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Publication number
JPH09504568A
JPH09504568A JP7513190A JP51319095A JPH09504568A JP H09504568 A JPH09504568 A JP H09504568A JP 7513190 A JP7513190 A JP 7513190A JP 51319095 A JP51319095 A JP 51319095A JP H09504568 A JPH09504568 A JP H09504568A
Authority
JP
Japan
Prior art keywords
adhesive
substrate
porous
conductive
polyurethane
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.)
Pending
Application number
JP7513190A
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English (en)
Inventor
ロバート キング，デビッド
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WL Gore and Associates Inc
Original Assignee
WL Gore and Associates Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by WL Gore and Associates Inc filed Critical WL Gore and Associates Inc
Publication of JPH09504568A publication Critical patent/JPH09504568A/ja
Pending legal-status Critical Current

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    • H—ELECTRICITY
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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
    • 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
    • C—CHEMISTRY; METALLURGY
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    • 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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    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
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  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

(57)【要約】 多孔質基材の中を通って延びる多数の通路を有する多孔質基材から作成された導電性接着剤が開示される。通路を画定する基材の壁は、導電性金属でコーティングされる。これは、多孔質基材の１つの面から他の面に連続したコーティングを与える。残りの通路の空間は、接着剤樹脂で実質的に満たされる。この接着剤は、２つの金属表面を電気的に接続するために使用されることができる。

Description

【発明の詳細な説明】 導電性接着剤 発明の背景 多くのエレクトロニクスの用途において、２つの別個な部品を適切にアースす る目的で、２つの金属表面を接続することが必要である。これらの部品は、ＩＣ チップ、パッケージ、ハイブリッド部品、マルチチップモジュール、プリント回 路板、セラミック基板、放熱子、シャシー、及びハウジングなどの品目であるこ とができる。２つの部品をネジやクランプで機械的に固定することが非実用的又 は不可能なことが多くあり、この場合、導電性接着剤を使用することが望まれる 。 通常、例えば炭素や銀などの導電性粒子を充填されたエポキシ樹脂のようなポ リマー系導電性接着剤が使用される。しかしながら、粒子が経時的にマトリック ス中を移動して導電率が変化しやすいため、樹脂マトリックス中の粒子が良好な 導電効率を与えないことがしばしばある。その上、高い導電率が必要な用途にお いて、接着剤中の粒子の量は、場合により８０％ものフィラーのように多量なこ とが必要である。この多量の粒子は、樹脂マトリックスを通しての粒子と粒子の 接触を保証するために必要である。この多量の粒子は、樹脂／フィラーの組み合 わせを脆くさせ又は弱い結合強度にさせる。 粒子と粒子の接触の高い表面抵抗のため、高い導電率を必要とする用途は銀粒 子を使用しなければならず、これはその他の金属は過度に早期に酸化物を形成し 、より高い抵抗の接着剤を生成するためである。しかも、アルミニウムのパーツ と結合する必要があって高 い導電率が必要な場合、銀粒子を使用するには問題があり、これは銀がアルミニ ウムとガルバーニ電気的に反応し、腐食を生じさせるためである。 発明の要旨 上記の問題を解決するため、本発明は、基材の中を通って延びる多数の通路を 有する多孔質基材を含む導電性接着剤を提供するものであり、通路を画定する基 材の壁は、基材の１つの面から他の面に連続したコーティングを与えるように導 電性金属でコーティングされ、残りの通路の体積は実質的に接着剤樹脂で満たさ れる。 図面の簡単な説明 図１は、本発明の接着性フィルムの横断面である。 発明の詳細な説明 図１に関し、本発明において、基材の１つの面から他の面に延びる通路11を有 する基材構造体10が提供される。この基材は、布帛、多孔質膜、フォームなどで あることができる。好ましくは、接着性基材として使用されたときに追従性(com pliance)を与えるように、弾力性があり且つ圧縮可能であるべきである。布帛は 、必要な通路を有すれば、織物、不織布、編物などでよい。代表的な布帛は、ポ リアミド、ポリテトラフルオロエチレン、ポリエステル、ポリウレタン、ポリイ ミドなどでよい。その強度、圧縮性、耐熱性、難燃性、及び化学的不活性のゆえ に特に好ましい基材は米国特許第３９５３５６６号明細書に記載のような延伸膨 張多孔質ポリテトラフルオロエチレン（ＰＴＦＥ）であり、これはフィブリルに よって相互に接続されたノードの微細構造を有し、ノードとフィブリルが連続し た通路又は気孔を画定する。 本基材は一般に０．３〜４０ミル（７．６μｍ〜１ｍｍ）の厚さを有し、一般 にシートの形態を取るであろうが、その形状は、一緒に結合されようとする部品 に合致されることができる。 通路の壁はそれに導電性金属12（図１参照）を接着させ、これは、無電解メッ キ法によって壁の上に形成されることができる。代表的な導電性金属には、銅、 ニッケル、銀、金などがある。金属コーティング又はメッキは通路の空間を満た さず、通路を画定する材料を被覆するに過ぎない。 基材が、ポリエステル布帛のようなポリマー布帛の場合、そのような導電性メ ッキ基材は、商品名Ｆｌｅｃｔｒｏｎ材料としてモンサント社から入手可能であ る。 基材が延伸膨張多孔質ＰＴＦＥの場合、導電性メッキ基材はＭａｎｎｉｓｏの 米国特許第４５５７９５７号明細書に広く開示されたようにして調製されること ができる。 導電性金属材料が気孔の壁の上に適切に配置された後、残りの気孔空間が接着 剤13で満たされる（図１参照）。適当な接着剤には、エポキシ樹脂、アクリル樹 脂、ウレタン樹脂、シリコーン樹脂、ポリイミド樹脂、シアネートエステル樹脂 などがある。接着剤は、基材を接着剤の溶液に浸すことによって気孔の中に簡便 に吸収される。エポキシ樹脂接着剤について、適当な溶媒はメチルエチルケトン である。 このようにして調製されて得られた、接着剤を充填された導電性コーティング 基材は、導電性接着剤として有用である。 この接着剤は、部品を互いに結合させるために使用されることができる。一般 に、この接着剤は、２つの金属表面の間に配置され、必要により結合が形成され るまで熱と圧力が加えられる。接着剤の １つの面から他の面に延びる導電性コーティングのおかげで、１つの金属表面か ら他の金属表面に電流が流れる。例１ Ｗ．Ｌ．Ｇｏｒｅ ＆ Ａｓｓｏｃｉａｔｅｓ社によって作成されたパーツ番 号ＮＣ１７２０１−０４−１のメッキされた多孔質ＰＴＦＥの厚さ５ミル（１２ ７μｍ）のシート基材を用い、導電性接着剤を調製した。 このシートは、メチルエチルケトン（ＭＥＫ）溶媒中のエポキシ接着剤樹脂（ Ｎｅｌｃｏ Ｎ−４２０５−２）（固形分２０重量％）に２５℃で１５秒間浸す ことによって含浸させた。次いでその溶媒をオーブン中で１６３℃で蒸発させた 。エポキシを吸収させたシートは、重量で３０％のエポキシ樹脂を含むと測定さ れた。 前記のようにして調製した接着剤生成物を、２枚のアルミニウム板を結合させ ることによって試験した。具体的には、表面処理用薬剤で処理してない直径２イ ンチ（５．０８ｃｍ）の２枚のアルミニウム板を、それらの間にその接着剤生成 物のシートを配置してオーブンの中に入れた。結合をもたらすために１５０℃で １ｐｓｉ（２．８８ｋｇ／ｃｍ2）の圧力を１時間適用した。電流が、このアセ ンブリーを通して１つの板から他の板に流れた。アルミニウムと導電性接着剤を 通して０．０１オーム未満の抵抗が測定され、これはアルミニウムの表面抵抗を 含んだ。例２ Ｆｌｅｃｔｒｏｎ不織ポリエステル布帛と表示された、モンサント社による作 成の厚さ１５ミルの不織ポリエステル布帛を用い、導電性接着剤を調製した。Ｆ ｌｅｃｔｒｏｎ布帛は、全重量で２．５オンス／平方ヤードであり、少なくとも ０．６４オンス／平方ヤー ドの金属重量を含んだ。布帛の金属メッキは、銅の上にメッキされたニッケルで あった。 次いでＭＥＫ溶媒中の高温用エポキシ接着剤樹脂（ＮｅｌｃｏＮ−４２０５− ６）で２５℃で１５秒間浸すことによって、メッキされたポリエステルの隙間に それを含浸させた。１６３℃に加熱してこの溶媒を蒸発させ、重量で３０％の樹 脂を含むメッキされた布帛が得られた。この材料は導電性接着剤を形成した。 この導電性接着剤を使用し、直径が３．０インチの２枚のアルミニウム板を互 いに結合させた。この結合は、例１と同じ装置内で１７６℃で５０ｐｓｉの圧力 を１．５時間適用して行った。アルミニウムと導電性接着剤を通じて０．００１ オーム未満の抵抗が測定された。例３ この例においては、Ｆｌｅｃｔｒｏｎ Ｈｌポリエステルタフタと表示された 、モンサント社によって作成された厚さ３．８ミル織物のポリエステル布帛を使 用した。この材料は、酸化防止剤の処理をしておいた銅でコーティングされてい た。ニッケルの下地コーティングは存在しなかった。例１に記載のようにして、 エポキシの吸収を行った。得られた接着剤は、３０重量％のエポキシ樹脂と２５ 重量％の金属を含んだ。樹脂でコーティングされ、金属処理された織物ポリエス テルからなるこの材料は、導電性接着剤を形成した。 この導電性接着剤を使用し、１．０インチ平方の２枚のアルミニウム板を互い に結合させた。この結合は、１ｐｓｉの圧力と１７６℃で１時間にわたって行っ た。アルミニウムと導電性接着剤を通じて０．５オーム未満の抵抗が測定された 。例４ エポキシ樹脂と銀粒子で作成された一般的な市販の導電性接着剤 （Ａｂｌｅｓｔｉｋによって作成されたＡｂｌｅｆｉｌｍ ＦＣＦ−５６１−０ ０３、Ｎａｔｉｏｎａｌ Ｓｔａｒｃｈ ａｎｄ Ｃｈｅｍｉｃａｌ社の１部門 ）を使用し、例１に記載したと同じタイプの板と同じ貼り合わせ条件を用い（結 合は１ｐｓｉの圧力と１５０℃で１時間にわたって行った）、直径が２．０イン チの２枚のアルミニウム板を互いに結合させた。４本プローブの抵抗計器を使用 し、Ａｂｌｅｓｔｉｋの製品と例１で結合された材料の両者の、アルミニウムと 接着剤を通じる抵抗を試験した。両サンプルを、同時に同じ装置の片の上で試験 した。市販の銀系接着剤についての抵抗値は２９１．３ミリオームと測定され、 一方で例１に示した接着剤についての抵抗値は８．６ミリオームと測定された。 例１に示した接着剤は、市販の接着剤によって示された抵抗値のわずか３％を有 するに過ぎないことの他に、例１に示された接着剤は、アルミニウムに対して非 腐食性であり、低温貯蔵を必要としない、取扱いが比較的容易である、隣接した パーツをショートさせることがある遊離した粒子が存在しないといった長所を有 する。
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Claims (1)

  1. 【特許請求の範囲】 １．基材の中を通って延びる多数の通路を有する多孔質基材を含んでなり、そ の通路を画定する基材の壁は、多孔質基材の１つの面から他方の面に連続したコ ーティングを提供するように導電性金属でコーティングされ、その残りの空間は 接着剤樹脂で実質的に満たされた導電性接着剤。 ２．基材が多孔質の有機系ポリマー又は多孔質の布帛である請求の範囲第１項 に記載の接着剤。 ３．基材が、ポリテトラフルオロエチレン、ポリアミド、ポリウレタン、ポリ エステル、ポリオレフィン、ポリウレタン、及びポリイミドからなる部類より選 択された有機系ポリマーである請求の範囲第１項に記載の接着剤。 ４．基材が多孔質ポリテトラフルオロエチレンのシートである請求の範囲第１ 項に記載の接着剤。 ５．基材が、ポリテトラフルオロエチレン、ポリアミド、ポリウレタン、ポリ エステル、ポリオレフィン、ポリウレタン、及びポリイミドからなる部類より選 択された有機繊維で作成された多孔質布帛である請求の範囲第１項に記載の接着 剤。 ６．導電性金属が、銅若しくはニッケル、又は銅とニッケルの配列である請求 の範囲第１又は３項に記載の接着剤。 ７．樹脂が、エポキシ、ウレタン、アクリル、及びシアネートエステルからな る部類より選択された有機系ポリマーを含んでなる請求の範囲第１又は３項に記 載の接着剤。
JP7513190A 1993-11-03 1994-03-03 導電性接着剤 Pending JPH09504568A (ja)

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US14719693A 1993-11-03 1993-11-03
US08/147,196 1993-11-24
PCT/US1994/002273 WO1995012643A1 (en) 1993-11-03 1994-03-03 Electrically conductive adhesives

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DE69411940D1 (de) 1998-08-27
CN1103423A (zh) 1995-06-07
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US5604026A (en) 1997-02-18

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