JP6108232B2 - 接着剤組成物、接着剤ワニス、接着フィルム、及び配線フィルム - Google Patents
接着剤組成物、接着剤ワニス、接着フィルム、及び配線フィルム Download PDFInfo
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- JP6108232B2 JP6108232B2 JP2013255557A JP2013255557A JP6108232B2 JP 6108232 B2 JP6108232 B2 JP 6108232B2 JP 2013255557 A JP2013255557 A JP 2013255557A JP 2013255557 A JP2013255557 A JP 2013255557A JP 6108232 B2 JP6108232 B2 JP 6108232B2
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Classifications
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- H—ELECTRICITY
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Description
)成分及び(C)成分の総量が、7〜60質量部である接着剤組成物。
(A)側鎖に複数の水酸基を含有するフェノキシ樹脂:100質量部、
(B)分子中に1つのイソシアネートと、ビニル基、アクリレート基及びメタクリレート基からなる群から選ばれる少なくとも1つの官能基とを有する多官能イソシアネート化合物:2〜55質量部、
(C)複数のマレイミド基を分子中に有するマレイミド化合物又は/及びその反応生成物:5〜30質量部、及び
(D)平均粒子径が5μm以下である1種類以上の無機フィラー:1〜50質量部
(E)ウレタン化触媒:0.001〜0.1質量部、及び
(F)ラジカル重合禁止剤:0.0002〜1質量部
本実施の形態に係る接着剤組成物は、下記(A)、(B)、(C)、及び(D)成分を、下記配合量で含有し、かつ(B)成分及び(C)成分の総量が、7〜60質量部であるものである。
(A)側鎖に複数の水酸基を含有するフェノキシ樹脂:100質量部、
(B)分子中に1つのイソシアネートと、ビニル基、アクリレート基及びメタクリレート基からなる群から選ばれる少なくとも1つの官能基とを有する多官能イソシアネート化合物:2〜55質量部、
(C)複数のマレイミド基を分子中に有するマレイミド化合物又は/及びその反応生成物:5〜30質量部、及び
(D)平均粒子径が5μm以下である1種類以上の無機フィラー:1〜50質量部
ものである。
1.接着剤組成物
本実施の形態に係る接着剤組成物は、下記(A)、(B)、(C)、及び(D)成分を、下記配合量で含有し、かつ(B)成分及び(C)成分の総量が、7〜60質量部であるように構成される。
(A)側鎖に複数の水酸基を含有するフェノキシ樹脂:100質量部、
(B)分子中に1つのイソシアネートと、ビニル基、アクリレート基及びメタクリレート基からなる群から選ばれる少なくとも1つの官能基とを有する多官能イソシアネート化合物:2〜55質量部、
(C)複数のマレイミド基を分子中に有するマレイミド化合物又は/及びその反応生成物:5〜30質量部、及び
(D)平均粒子径が5μm以下である1種類以上の無機フィラー:1〜50質量部
本実施の形態に係る接着剤組成物に用いられる(A)成分は、側鎖に複数の水酸基を含有するフェノキシ樹脂である。(A)成分は、ベース樹脂として用いられるため、保存安定性、接着後の耐熱性、及び耐湿信頼性に優れた、5%熱質量減少温度が350℃を超えるフェノキシ樹脂が用いられている。
本実施の形態に係る接着剤組成物に用いられる(B)成分は、分子中に1つのイソシアネートと、ビニル基、アクリレート基及びメタクリレート基からなる群から選ばれる少なくとも1つの官能基とを有する多官能イソシアネート化合物から構成される。
本実施の形態に係る接着剤組成物に用いられる(C)成分は、複数のマレイミド基を分子中に有するマレイミド化合物又は/及びその反応生成物から構成される。
本実施の形態に係る接着剤組成物に用いられる(D)成分は、平均粒子径が5μm以下である1種類以上の無機フィラーから構成される。平均粒子径は、レーザー回析法により測定した粒子径の粒度分布におけるメジアン径(d50)とした。
本実施の形態に係る接着剤組成物に、必要に応じて用いられる(E)成分は、ウレタン化触媒から構成される。(E)成分を構成するウレタン化触媒は、(B)成分を構成する多官能イソシアネート化合物と、(A)成分を構成するフェノキシ樹脂との間のウレタン結合の生成を促進する機能を有する。
本実施の形態に係る接着剤組成物に、必要に応じて用いられる(F)成分は、ラジカル重合禁止剤から構成される。(F)成分を構成するラジカル重合禁止剤は、接着剤調整時、接着剤ワニスの保管時、及び接着フィルム保管時等における不要なラジカル重合反応を抑制する機能を有する。最終的には接着層の酸化防止剤としての機能を有するとともに、配線フィルムの熱安定性向上にも寄与する機能を有する。
本実施の形態に係る接着剤組成物には、必要に応じて、ラジカル重合開始剤を含有させることができる。ラジカル重合開始剤は、(C)成分を構成するマレイミド化合物、(B)成分を構成する多官能イソシアネート化合物と(A)成分を構成するフェノキシ樹脂との反応生成物の架橋反応を促進する機能を有する。
本実施の形態に係る接着剤ワニスは、上述の接着剤組成物と、メチルエチルケトンとを含有するように構成される。すなわち、本実施の形態に係る接着剤ワニスは、上述の接着剤組成物をワニス化する溶媒として、沸点が100℃以下の汎用溶媒であるメチルエチルケトンを用いている。
図1に示すように、第1の実施の形態に係る接着フィルムは、ポリイミド基材1上の片面に、上述の接着剤組成物から構成された(接着剤ワニスから作製された)接着層2を有するように構成される。この接着フィルムを片面接着フィルムということがある。
図3に示すように、第1の実施の形態に係る配線フィルムは、上述の接着フィルムを接着層2が互いに対向するように配置し、その間に挟持されるように導体配線3を配設し、さらに接着層2を熱融着することによって作製されたものとして構成される。
(1)接着剤ワニスの調製
(A)成分を構成するフェノキシ樹脂として、ビスフェノールA型のフェノキシ樹脂(新日鉄住友化学社製、商品名:YP−50、スチレン換算質量平均分子量:73000)100質量部、(B)成分を構成する多官能イソシアネート化合物として、2−メタクリロイルオキシエチルイソシアネート(昭和電工社製、商品名:カレンズ(登録商標)MOI)10質量部、(C)成分を構成するマレイミド化合物として、ビスマレイミド(大和化成工業社製、商品名:BMI−5100)20質量部、(D)成分を構成する無機フィラーとして、タルク(含水ケイ酸マグネシウム)(日本タルク社製、商品名:ナノエースD−1000、平均粒子径:1μm)5質量部、(E)成分を構成するウレタン化触媒として、ジラウリン酸ジブチル錫(和光純薬工業社製、商品名:DBTDL)0.006質量部(MEK溶媒と混合した溶液に対して1質量%)、及び(F)成分を構成するラジカル重合禁止剤として、ジブチルヒドロキシトルエン(和光純薬工業社製、商品名:BHT)0.003質量部(MEK溶媒と混合した溶液に対して1質量%)の配合組成で、各成分を配合し、メチルエチルケトン(MEK)に40℃で24時間撹拌し、接着剤ワニスを調製した。
ポリイミド基材上に所定のギャップを有するアプリケーターを用いて、得られた接着剤ワニスを塗布し、80℃で10分、さらに100℃で5分乾燥し、接着フィルムを作製した。ポリイミド基材上に形成された接着層の膜厚は、25μmに調整した。ポリイミド基材として、ポリイミドフィルム(東レ・デュポン社製、商品名:カプトン(登録商標)100V)を用いた。
実施例1において、表1に示す配合組成に変えて接着剤ワニスを調製したこと以外は、実施例1と同様にして、接着フィルムを作製した。
実施例1において、表2に示す配合組成に変えて接着剤ワニスを調製したこと以外は、実施例1と同様にして、接着フィルムを作製した。
得られた接着フィルムについて、以下の評価試験を行った。評価結果を表1及び表2に示す。
平滑な板上に1枚の接着フィルムを接着層面が表面になるように固定する。その上に、もう1枚の接着フィルムを接着層面が向き合うように重ね、重ねた接着フィルムを手で滑らせ、引っ掛かりがなく滑る場合は、○(合格)、引っ掛かりが生じ滑りが悪い場合は、×(不合格)とした。
接着フィルムの接着層を目視で確認し、ツブが確認できなければ、○(合格)、ツブが確認できた場合は、×(不合格)とした。
導体を以下のようにして準備した。すなわち、厚さ300μmの無酸素銅箔表面に、0.5μmのNiめっき層を電気めっきにより形成させ、このNiめっき導体をUVオゾン処理で洗浄後、3−メタクリロキシプロピルトリメトキシシランの1%水溶液に3分間浸漬し取り出し、110℃で10分間乾燥し、シラン処理を行い、導体を得た。接着フィルムの接着層側に、得られた導体を置き、160℃、1MPaの条件で10分間加圧し、接着させた。さらに、大気中で、無加圧で180℃、60分間後加熱しサンプルフィルムを得た。サンプルフィルムを幅1cmに切り出したサンプルについて、導体と接着フィルム間で180°剥離試験を実施した。剥離強度(N/mm)が0.7N/mm以上を○(合格)とし、0.6N/mm以上、0.7N/mm未満を△(不合格)、0.6N/mm未満を×(不合格)とした。
初期接着力評価用のサンプルを、85℃、湿度85%の恒温恒湿環境に1000時間静置した。その後、180°剥離試験を実施した。剥離強度(N/mm)が0.7N/mm以上を○(合格)とし、0.6N/mm以上、0.7N/mm未満を△(不合格)、0.6N/mm未満を×(不合格)とした。
接着フィルムの接着層面に上記導体を置き、160℃、1MPaの条件で10分間加圧し、接着させた。さらに、大気中で無加圧で180℃、60分間後加熱した。本サンプルを280℃はんだ浴槽に浮かべて1時間保持した。外観検査で膨れの発生がないものを、○(合格)、膨れが発生したものを×(不合格)とした。
表1及び表2から以下のことが分かる。
2 接着層
3 導体配線
Claims (10)
- 下記(A)、(B)、(C)、及び(D)成分を、下記配合量で含有し、かつ(B)成分及び(C)成分の総量が、7〜60質量部である接着剤組成物。
(A)側鎖に複数の水酸基を含有するフェノキシ樹脂:100質量部、
(B)分子中に1つのイソシアネートと、ビニル基、アクリレート基及びメタクリレート基からなる群から選ばれる少なくとも1つの官能基とを有する多官能イソシアネート化合物:2〜55質量部、
(C)複数のマレイミド基を分子中に有するマレイミド化合物又は/及びその反応生成物:5〜30質量部、及び
(D)レーザー回析法による平均粒子径が5μm以下である1種類以上の無機フィラー:1〜50質量部 - 下記(E)及び(F)成分を、下記配合量でさらに含有する請求項1に記載の接着剤組成物。
(E)ウレタン化触媒:0.001〜0.1質量部、及び
(F)ラジカル重合禁止剤:0.0002〜1質量部 - 前記(D)成分を構成する無機フィラーは、マグネシウム、アルミニウム、ケイ素及びカルシウムからなる群から選ばれる少なくとも1つの元素を含む酸化物、水酸化物、炭酸塩、又はケイ酸塩である請求項1又は2に記載の接着剤組成物。
- 前記(A)成分を構成するフェノキシ樹脂は、40,000〜100,000のスチレン換算質量平均分子量を有する請求項1〜3のいずれか1項に記載の接着剤組成物。
- 請求項1〜4のいずれかに記載の接着剤組成物と、メチルエチルケトンとを含有する接着剤ワニス。
- ポリイミド基材上の片面又は両面に、請求項1〜4のいずれか1項に記載の接着剤組成物から構成された接着層を有する接着フィルム。
- 前記接着層は、10〜100μmの厚さを有し、かつ前記ポリイミド基材は、25〜100μmの厚さを有する請求項6に記載の接着フィルム。
- 請求項6又は7に記載の接着フィルムを前記接着層が互いに対向するように配置し、その間に挟持されるように導体配線を配設し、さらに前記接着層を熱融着することによって作製された配線フィルム。
- 請求項6又は7に記載の接着フィルムのうち、前記接着層を前記ポリイミド基材上の一方の面に有する片面接着フィルムを、前記接着層を両面に有する両面接着フィルムの両側に前記接着層が互いに対向するように配置し、前記片面接着フィルムと前記両面接着フィルムとの間にそれぞれ挟持されるように導体配線を配設し、さらに前記接着層を熱融着することによって作製された配線フィルム。
- 前記導体配線は、35〜500μmの厚さを有する請求項8又は9に記載の配線フィルム。
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