JP6084145B2 - 異方導電性接着組成物およびこれを用いた異方導電性接着フィルム - Google Patents
異方導電性接着組成物およびこれを用いた異方導電性接着フィルム Download PDFInfo
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- JP6084145B2 JP6084145B2 JP2013210566A JP2013210566A JP6084145B2 JP 6084145 B2 JP6084145 B2 JP 6084145B2 JP 2013210566 A JP2013210566 A JP 2013210566A JP 2013210566 A JP2013210566 A JP 2013210566A JP 6084145 B2 JP6084145 B2 JP 6084145B2
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- conductive adhesive
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- 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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- 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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- 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
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- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
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- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/35—Heat-activated
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Description
さらに、本発明の第三は、上記異方導電性接着組成物を含む異方導電性接着フィルムであって、硬化前の引張強度が5kgf/cm2以上である、異方導電性接着フィルムである。
本発明の第一は、テトラヒドロフルフリル系(メタ)アクリレートおよびフルフリル系(メタ)アクリレートのうち少なくとも一方と、熱硬化性の重合開始剤と、を含む異方導電性接着組成物であって、前記異方導電性接着組成物の全体固形重量を基準として、前記テトラヒドロフルフリル系(メタ)アクリレートおよびフルフリル系(メタ)アクリレートのうち少なくとも一方を1質量%ないし25質量%含む、異方導電性接着組成物である。
本発明の異方導電性接着組成物は、テトラヒドロフルフリル系(メタ)アクリレートおよびフルフリル系(メタ)アクリレートのうち少なくとも一方と、熱硬化性の重合開始剤とを必須に含むが、これら以外に、熱可塑性樹脂を含んでいると好ましい。このとき、異方導電性接着組成物は、当該組成物の全体固形重量を基準として、前記熱可塑性樹脂を50質量%ないし80質量%含んでいると好ましい。さらに、本発明の異方導電性接着組成物中、熱可塑性樹脂は、異方導電性接着組成物の全体固形重量を基準として、45質量%ないし75質量%含まれているとより好ましく、55質量%ないし73質量%で含まれていると特に好ましい。なお、二種以上の熱可塑性樹脂を用いる場合は、その合計質量が上記範囲内であると好ましい。
本発明の異方導電性接着組成物は、テトラヒドロフルフリル系(メタ)アクリレートまたはフルフリル系(メタ)アクリレートを必須に含む。これらを熱硬化性ラジカル重合性物質として使用することにより、異方導電性接着組成物の接着力を改善することができる。
上記化学式1で表される化合物を用いることにより、異方導電性接着組成物の接着性をさらに向上させることができる。
本発明の異方導電性接着組成物は、テトラヒドロフルフリル系(メタ)アクリレートおよびフルフリル系(メタ)アクリレートのうち少なくとも一方と、熱硬化性の重合開始剤とを必須に含むが、これら以外に、その他の熱硬化性ラジカル重合性物質をさらに含んでいると好ましい。ラジカル重合性物質は特に制限されるものではなく、ラジカル重合による重合が可能な化合物であれば如何なるものでも可能であるが、たとえば、エポキシ基変性アクリル系モノマー又はポリマー、またはリン含有アクリル系モノマーが好ましく用いられる。
本発明の異方導電性接着組成物は、熱硬化性重合開始剤を必須に含むが、このとき、当該組成物の全体固形重量を基準として、前記熱硬化性重合開始剤を0.5質量%ないし5質量%含んでいると好ましい。さらに、本発明の異方導電性接着組成物中、熱硬化性重合開始剤は、異方導電性接着組成物の全体固形重量を基準として、1質量%ないし4質量%含まれているとより好ましい。二種以上の熱硬化性重合開始剤を用いる場合は、これらの合計質量が上記範囲となると好ましい。
本発明の異方導電性接着組成物は、テトラヒドロフルフリル系(メタ)アクリレートおよびフルフリル系(メタ)アクリレートのうち少なくとも一方と、熱硬化性の重合開始剤を必須に含むが、これら以外に、導電性粒子を含んでいると好ましい。このとき、異方導電性接着組成物は、当該組成物の全体固形重量を基準として、導電性粒子を1質量%ないし10質量%含んでいると好ましい。かような質量比とすることにより、ショート等を防止し、良好な電気的特性が得られると共に、安定的な電気的特性の発現が可能である。さらに、導電性粒子は、異方導電性接着組成物の全体固形重量を基準として、1質量%ないし5質量%含まれているとより好ましい。二種以上の導電性粒子を用いる場合は、これらの合計質量が上記範囲内となると好ましい。
本発明の異方導電性接着組成物は、基本物性を阻害しないと同時に付加的な物性を付与するために、補強剤、重合防止剤、酸化防止剤、熱安定剤等の添加剤をさらに含んでいてもよい。これらは単独で使用されてもまたは2種以上が混合されて使用されてもよい。添加剤の含有量は特に制限されないが、異方導電性接着組成物の全体固形重量を基準として、0.01質量%ないし10質量%含まれていると好ましい。二種以上の添加剤を用いる場合は、これらの合計質量が上記範囲内となると好ましい。
本発明は、本発明に係る異方導電性接着組成物を含む、異方導電性接着フィルムもまた提供する。
前記接着率の減少率は、好ましくは0を超えて20%以下、より好ましくは0を超えて15%以下、特に好ましくは5%以上14%以下になり得る。
本発明は、上記異方導電性接着組成物または異方導電性接着フィルムによって接続された半導体装置もまた提供する。すなわち、本発明の第四は、上記異方導電性接着組成物または異方導電性接着フィルムによって接続されてなる、半導体装置である。
(製造例1:ブタジエン樹脂)
25体積%でトルエン/メチルエチルケトンに溶解されたアクリロニトリルブタジエン共重合体(Zeon Chemicals社製,1072CGX)を準備した。
50体積%でメチルエチルケトンを溶剤として使用して、ポリオール含量60重量%、脂肪族ジイソシアネート39重量%、ヒドロキシメタクリレート1重量%を用いて合成した。まず、ポリオールと脂肪族ジイソシアネートを反応させて脂肪族イソシアネートを末端に有するプレポリマーを合成した。次に、合成されたプレポリマーとヒドロキシメタクリレートを反応させてポリウレタンアクリレート樹脂(ウレタン樹脂1)を製造した。この際、ヒドロキシメタクリレート/プレポリマーの末端の脂肪族イソシアネート(イソシアネート基)比=0.5として温度90℃、圧力1気圧、反応時間5時間の条件下で、ジブチルチンジラウリレート(ジラウリン酸ジブチルスズ)を触媒として使用して重合反応させた。
50体積%でメチルエチルケトンを溶剤として使用して、ポリオール含量60重量%、脂肪族ジイソシアネート39重量%、ヒドロキシメタクリレート1重量%を用いて合成した。まず、ポリオールと脂肪族ジイソシアネートを反応させて脂肪族イソシアネートを末端に有するプレポリマーを合成した。次に、合成されたプレポリマーとヒドロキシメタクリレートを反応させてポリウレタンアクリレート樹脂(ウレタン樹脂2)を製造した。この際、ヒドロキシメタクリレート/プレポリマーの末端の脂肪族イソシアネート(イソシアネート基)比=1として温度90℃、圧力1気圧、反応時間5時間の条件下で、ジブチルチンジラウリレート(ジラウリン酸ジブチルスズ)を触媒として使用して重合反応させた。
エポキシアクリレートポリマー(昭和高分子社製,SP1509)を準備した。
テトラヒドロフルフリルメタクリレート(ミウォン商事社製,M151)を準備した。
アルコキシ化されたテトラヒドロフルフリルアクリレート(Sartomer社製,CD611)を準備した。
ベンゾイルパーオキサイド(Hansol Chemience co.、Ltd.社製、Perox−B75)を準備した。
直径5μmの大きさの導電性粒子(Inco社製、T255)を準備した。
Fumedシリカ(Degussa社製、R812)を準備した。
(実施例1)
それぞれが下記表1に記載の割合(ただし、表1中の記載は固形分の組成比であり、異方導電性接着組成物の全体の固形重量を基準としたときの質量%を示す)となるように、ブタジエン樹脂、ウレタン樹脂1および2、ラジカル重合性物質1および2、熱硬化性(ラジカル)重合開始剤、導電性粒子ならびにシリカを、有機溶媒であるトルエンに配合し、自転公転式ミキサーを使用して溶解、分散させて、異方導電性接着組成物(異方導電性接着組成物のトルエン溶液)を得た。なお、ここで用いた各成分(ブタジエン樹脂、ウレタン樹脂、ラジカル重合性物質、熱硬化性重合開始剤、導電性粒子およびシリカ)は、上記の製造例によって得られたものをそれぞれ使用した。
前記実施例1において異方導電性接着組成物の構成を下記表1のように変更したことを除いては、前記実施例1と同様の方法で異方導電性接着組成物を製造した。さらに、得られた異方導電性接着組成物を用いて、実施例1と同様の方法で異方導電性接着フィルムを製造した。
前記実施例1において異方導電性接着組成物の構成を下記表1のように変更したことを除いては、前記実施例1と同様の方法を用いて異方導電性接着組成物を製造した。さらに、得られた異方導電性接着組成物を用いて、実施例1と同様の方法で異方導電性接着フィルムを製造した。
前記実施例と比較例で製造した異方導電性接着フィルムの接着力、接続抵抗および硬化前引張強度を下記の通り測定し、その結果を表2に示した。
前記実施例および比較例で製造された異方導電性接着フィルムの接着力を評価するために、ピッチ200μmのPCB(製造元:BH Flex,端子幅100μm、端子間距離100μm)とCOF(端子幅100μm、端子間距離100μm)を使用した。異方導電性接着フィルムをPCB回路端子に70℃、1MPaで1秒間仮圧着した後、離型フィルムを除去し、次いでCOFの回路端子を対置させ、180℃、3MPaで5秒間本圧着した。このように製造された試片について、下記の方法を用いて接着力(gf/cm)を測定し、これを初期接着力とした。
2)ロードセルに装着が完了したらグリップを設置して測定準備を完了させ、
3)サンプル(試片)をグリップに噛ませた後、引張試験速度50mm/min条件で測定した。
前記実施例および比較例で製造された異方導電性接着フィルムの回路接続性能を評価するために、前記接着力評価時と同様の条件で仮圧着、本圧着および信頼性評価を行った。
前記実施例および比較例で製造された異方導電性接着フィルムの硬化前の引張強度について評価した。測定は、25℃で、引張試験はUTM(Universal Testing Machine)を用いて測定行った。UTM装備はモデルを使用した。具体的な試験方法は下記の通りである。
2)ロードセルに装着が完了したらグリップを設置して測定準備を完了させ、
3)サンプル(試片)をグリップに噛ませた後、引張試験速度50mm/min条件で測定した。
Claims (10)
- テトラヒドロフルフリル系(メタ)アクリレートおよびフルフリル系(メタ)アクリレートのうち少なくとも一方と、熱硬化性の重合開始剤と、導電性粒子と、を含む異方導電性接着組成物であって、
前記異方導電性接着組成物の全体固形重量を基準として、前記テトラヒドロフルフリル系(メタ)アクリレートおよびフルフリル系(メタ)アクリレートのうち少なくとも一方を1質量%ないし25質量%含み、前記導電性粒子を1質量%ないし10質量%含む、異方導電性接着組成物。 - 前記テトラヒドロフルフリル系(メタ)アクリレートまたは前記フルフリル系(メタ)アクリレートが、アルコキシ化されたテトラヒドロフルフリル系(メタ)アクリレートまたはアルコキシ化されたフルフリル系(メタ)アクリレートである、請求項1に記載の異方導電性接着組成物。
- 前記アルコキシ化されたテトラヒドロフルフリル系アクリレートが下記化学式1の構造を有する、請求項2に記載の異方導電性接着組成物。
- 熱可塑性樹脂をさらに含む、請求項1ないし3のいずれか1項に記載の異方導電性接着組成物。
- 前記テトラヒドロフルフリル系(メタ)アクリレートまたは前記フルフリル系(メタ)アクリレート以外のラジカル重合性物質をさらに含む、請求項1ないし4のいずれか1項に記載の異方導電性接着組成物。
- 請求項1ないし5のいずれか1項に記載の異方導電性接着組成物を含む異方導電性接着フィルムであって、
下記式1で計算されるフィルムの接着力の減少率が0を超えて25%以下である、異方導電性接着フィルム。
- 請求項1ないし5のいずれか1項に記載の異方導電性接着組成物を含む異方導電性接着フィルムであって、
硬化前の引張強度が5kgf/cm2以上である、異方導電性接着フィルム。 - 前記異方導電性接着組成物は、前記異方導電性接着組成物の全体固形重量を基準として、50質量%ないし80質量%の熱可塑性樹脂をさらに含む、請求項6または7に記載の異方導電性接着フィルム。
- 下記式1で計算されるフィルムの接着力の減少率が0を超えて25%以下である、請求項7に記載の異方導電性接着フィルム。
- 請求項1ないし5のいずれか1項に記載の異方導電性接着組成物、または請求項6ないし9のいずれか1項に記載の異方導電性接着フィルムによって接続されてなる、半導体装置。
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