JP5278785B2 - 熱硬化型樹脂組成物、その硬化物およびプリント配線板用層間接着フィルム - Google Patents
熱硬化型樹脂組成物、その硬化物およびプリント配線板用層間接着フィルム Download PDFInfo
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Description
測定装置 : 東ソー株式会社製 HLC−8320GPC、UV8320
カラム : 東ソー株式会社製 SuperAWM−H 2本
検出器 : RI(示差屈折計)及びUV(254nm)
データ処理:東ソー株式会社製 EcoSEC−WorkStation
測定条件: カラム温度 40℃
溶媒 DMF
流速 0.35ml/分
標準 :ポリスチレン標準試料にて検量線作成
試料 :樹脂固形分換算で0.2重量%のDMF溶液をマイクロフィルターでろ過したもの(注入量:10μl)
ポリイミド樹脂を樹脂濃度が0.5g/dlとなるようにN−メチル−2−ピロリドンに溶解して樹脂溶液を得た。樹脂溶液の溶液粘度、及び、溶媒粘度(N−メチル−2−ピロリドンの粘度)を30℃で、ウベローデ型の粘度管により測定して、得られた測定値を下記の式にあてはめて求めた。
上記式中、V1 はウベローデ型粘度管により測定した溶液粘度を示し、V2 はウベローデ型粘度管により測定した溶媒粘度を示す。ここで、V1 及びV2 は樹脂溶液及び溶媒(N−メチル−2−ピロリドン)が粘度管のキャピラリーを通過する時間から求めた。また、V3 は、ポリマー濃度(g/dl)である。
攪拌装置、温度計およびコンデンサーを付けたフラスコに、DMAC(ジメチルアセトアミド)213.2gとTDI(トリレンジイソシアネート)6.29g(0.036モル)、TODI(4,4’−ジイソシアネート−3,3’−ジメチル−1,1’−ビフェニル)37.8g(0.143モル)とTMA(無水トリメリット酸)29.0g(0.151モル)、BTDA(ベンゾフェノン−3,3’,4,4’−テトラカルボン酸二無水物、)12.2g(0.038モル)とを仕込み、攪拌を行いながら発熱に注意して1時間かけて150℃まで昇温した後、この温度で5時間反応させた。反応は炭酸ガスの発泡とともに進行し、系内は茶色の透明液体となった。25℃での粘度が2Pa・sの樹脂固形分20%で溶液酸価が16(KOHmg/g)のポリイミド樹脂の溶液(ポリイミド樹脂がDMACに溶解した樹脂組成物)を得た。これをポリイミド樹脂(A1)の溶液と略記する。尚、その値から算出された樹脂の固形分酸価は64(KOHmg/g)であった。また、ゲルパーミエーションクロマトグラフィー(GPC)の測定の結果、重量平均分子量10000であった。
第1表に示す配合割合とした以外は合成例1と同様にしてポリイミド樹脂(A2)、(A4)及びポリイミド樹脂(A5)の溶液、比較対照用ポリイミド樹脂(a1)、(a3)及び(a4)の溶液を得た。合成例1と同様にビフェニル骨格の含有量、対数粘度、重量平均分子量及び固形分酸価を第1表に示す。
BTDAのかわりにBPDA(BPDA:ビフェニル−3,3’,4,4’−テトラカルボン酸無水物)を用い、さらに第1表に示す配合割合とした以外は合成例1と同様にしてポリイミド樹脂(A3)の溶液を得た。合成例1と同様にビフェニル骨格の含有量、対数粘度、重量平均分子量及び固形分酸価を第1表に示す。
測定不能:合成中、析出物が沈殿し、均一溶液として得られなかった為、測定できなかった。
第2表〜第4表に示した配合にて本発明の熱硬化性樹脂組成物1〜13及び比較対照用熱硬化性樹脂組成物1’〜4’を得た。得られた組成物の硬化物のTG、線膨張係数、溶融付着性及び難燃性の評価を行った。結果を第2〜第4表に示す。
(試験片の作製)
樹脂組成物を硬化後の膜厚が30μmになるようにブリキ基板上に塗装し、70℃の乾燥機で20分間乾燥した後、200℃で1時間硬化させ冷却した後、剥離した硬化塗膜を幅5mm、長さ30mmに切り出し、測定用試料を作製した。
セイコー電子(株)製熱分析システムTMA−SS6000を用いて、試料長10mm、昇温速度10℃/分、荷重30mNの条件でTMA(Thermal Mechanical Analysis)法により測定した。なお、TGは、TMA測定での温度−寸法変化曲線からその変極点を求め、その温度をTGとした。TGが高いほど耐熱性に優れることを示す。
前記<耐熱性の評価方法(TGの測定による評価)>と同様にして試験片を作製し、TMA−SS6000を用いて、試料長10mm、昇温速度10℃/分、荷重30mNの条件でTMA(Thermal Mechanical Analysis)法により測定した。線膨張係数に使用した温度域は20〜200℃での試料長の変位より求めた。線膨張係数が小さいほど寸法安定性に優れることを示す。
(試験片の作成)
熱硬化性樹脂組成物をPETフィルム(厚さ125μm)上に、乾燥後の樹脂組成物層の厚みが25μmとなるようにアプリケーターにて均一に塗布し、100℃で5分間乾燥させ、接着フィルムを得、これを試験片とした。
あらかじめ120℃に加熱した電解銅箔(厚さ18μm、表面粗さ:M面Rz 7.4μm,S面Ra 0.21μm)に上記の接着フィルムを樹脂面が銅と接するように重ね合わせ、溶融接着性を評価した。溶融接着に圧力が必要なものは、1.0MPaの圧力にて1分間熱プレスした。その後、PETフィルムをはがし、さらに200℃にて60分加熱することで樹脂組成物を本硬化させた。この試験片に対し、JIS K 5400 8.5.2(付着性 碁盤目テープ法)に従いテープ剥離試験を実施し、溶融接着性として以下の5段階の評価基準にて評価を行った。
○:1.0MPaの圧力にて溶融接着が可能であり、本硬化後、テープ剥離を実施して欠損部分の面積が試験実施面積に対して5%以上。
△:1.0MPaの圧力にて一部溶融接着するが、溶融接着した部分の面積が50%未満。
×:1.0MPaの圧力にて全く溶融接着しない。
(試験片の作製)
硬化性ポリイミド樹脂組成物を、得られる塗膜の膜厚が30μmになるようにブリキ基板上に塗装した。次いで、この塗装板を50℃の乾燥機で30分間、100℃の乾燥機で30分間、200℃の乾燥機で60分間乾燥して塗膜(フィルム)を作成した。室温まで冷却した後、剥離した硬化塗膜を幅10mm、長さ80mmの短冊状に切り出し、測定用試料とした。
短冊試料の長手方向の片末端をクランプに固定し、もう一方の末端を下方向で地面に垂直になるようにセットした。ライターでこの下部末端に着火して試料の燃焼挙動を観察した。評価は、着火部からの燃焼距離の試験の平均値を基準に下した。
○:5回の試験の試料の燃焼距離の平均値が2cm以上4cm未満である。
△:5回の試験の試料の燃焼距離の平均値が4cm以上6cm未満である。
×:5回の試験の試料の燃焼距離の平均値が6cm以上である。
エポキシ樹脂(850S):DIC(株)製 ビスフェノールA型液状エポキシ樹脂 エピクロン850−S(エポキシ当量 188g/eq)
YX4000:三菱化学(株)製 ビフェニル型エポキシ樹脂 YX4000(エポキシ当量 187g/eq)
EXA−4710:DIC(株)製 ナフタレン型エポキシ樹脂 エピクロンEXA−4710(エポキシ当量 173g/eq)
HCA−HQ:10−(2,5−ジヒドロキシフェニル)−10H−9−オキサ−10−ホスファフェナントレン−10−オキシド
HCA:9,10−ジヒドロ−9−オキサー10−ホスファフェナントレン−10−オキサイド
PBM:大和化成(株)製 m−フェニレンビスマレイミド BMI−3000H
MPBM:大和化成(株)製 4−メチル−1,3−フェニレンビスマレイミド BMI−7000
本発明のプリント配線板用層間接着フィルムを用いることにより銅箔との圧着時に低温で溶融しながら、硬化物の線膨張率が低い絶縁層を得ることができ、多層プリント配線板の層間絶縁層を形成する為に接着フィルムとして好適に用いられる。
Claims (16)
- 前記熱硬化型ポリイミド樹脂(A)が、更にベンゾフェノン構造を有するポリイミド樹脂である請求項1記載の熱硬化型ポリイミド樹脂組成物。
- 前記熱硬化型ポリイミド樹脂(A)が、更にトリレン構造を有するポリイミド樹脂である請求項1または2記載の熱硬化型ポリイミド樹脂組成物。
- 前記熱硬化型ポリイミド樹脂(A)がアルキレン構造を有さないポリイミド樹脂である請求項1〜3のいずれか1項記載の熱硬化型ポリイミド樹脂組成物。
- 前記熱硬化型ポリイミド樹脂(A)がビフェニル骨格を有するポリイソシアネートと酸無水物とを反応させて得られるポリイミド樹脂である請求項1〜4のいずれか1項記載の熱硬化型ポリイミド樹脂組成物。
- 前記ビフェニル骨格を有するポリイソシアネートがトリジンジイソシアネートまたはトリジンジイソシアネートから誘導されるポリイソシアネートである請求項5記載の熱硬化型ポリイミド樹脂組成物。
- 前記リン化合物(B)の含有量が、熱硬化型ポリイミド樹脂(A)とエポキシ樹脂(C)との合計100質量部に対して1〜100質量部である請求項1記載の熱硬化型ポリイミド樹脂組成物。
- 前記リン化合物(B)が、10−(2,5−ジヒドロキシフェニル)−10H−9−オキサ−10−ホスファフェナントレン−10−オキシドまたは9,10−ジヒドロ−9−オキサ−10−ホスファフェナントレン−10−オキサイドである請求項1記載の熱硬化型ポリイミド樹脂組成物。
- 前記エポキシ樹脂(C)がビスフェノールA型エポキシ樹脂、ビスフェノールF型エポキシ樹脂、ビスフェノールS型エポキシ樹脂、ビフェニル型エポキシ樹脂及びナフタレン型エポキシ樹脂からなる群から選ばれる1種以上のエポキシである請求項1記載の熱硬化型ポリイミド樹脂組成物。
- 更に、芳香環を有し、分子量が200〜1,000であるポリマレイミド化合物(D)とを含有する請求項1〜9のいずれか1項記載の熱硬化型ポリイミド樹脂組成物。
- 前記ポリマレイミド化合物(D)がフェニレンビスマレイミドまたはメチルフェニレンビスマレイミドである請求項10記載の熱硬化型ポリイミド樹脂組成物。
- ポリイミド樹脂(A)100質量部に対してポリマレイミド化合物(D)を5〜200質量部含有する請求項10記載の熱硬化型ポリイミド樹脂組成物。
- 請求項1〜14のいずれか1項記載の熱硬化型ポリイミド樹脂組成物を硬化させてなることを特徴とする硬化物。
- 請求項1〜14のいずれか1項に記載の熱硬化型ポリイミド樹脂組成物により形成される層を、キャリアフィルム上に有することを特徴とするプリント配線板用層間接着フィルム。
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