JP4947275B2 - 電子部品保護シートおよびコーティング方法 - Google Patents
電子部品保護シートおよびコーティング方法 Download PDFInfo
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Description
本発明の(a)成分の熱伸張性とは温度が高くなると伸張性を増す性質のことであり、伸張性とは引っ張り力を加えたときに、破断や亀裂が入ることなく伸びる方向に変形する性質である。すなわち、加熱することにより伸び易くなる性質であり、本発明では100℃、100MPaの引っ張り力に対し、150%以上の伸びを示すものがよい。また、加熱をすることにより伸びやすくなるとは、常温(20℃〜25℃程度)では全く伸びないという意味ではない。常温に於いても、伸びは有しても良いが、加熱をすることによりその伸び率が向上するというものである。また、本発明のいう伸張性とは引っ張り力を解除したときに戻ろうとする変形が起こるか起こらないかはどちらでもかまわないが、好ましくは変形が起こらない方がよい。
(a)成分として、タマポリ社製アイオノマーシートHM−07(50μm)を用いた。なお、これの80℃での伸張性は約300%であり、熱溶融開始温度は145℃である。また、熱溶融開始温度はJIS−K7210に準じ島津製作所社製フローテスターにて、φ1.0mm×10mmのダイを用い測定加重1.5MPaにて測定した。
これをゴムダイヤフラム式の真空ラミネーター装置中に入れ、電子基板と同一形状に成形したゴム型を用いて加熱温度80℃で5分真空圧着した。解放後、電子部品を取り出し、紫外線照射機で30kJ/m 2 の紫外線を照射した。
上記の実施例1の(b)成分から光開始剤を抜いたものを調製し、上述と同様の実験を行った。その結果、タクトスイッチを押してもLEDは発光しなかった。温度、湿度により銅配線パターンが腐食し短絡したものと思われる。
(a)タマポリ社製アイオノマーシートNC−5(30μm)の80℃での伸張性は500%以上であり、熱溶融開始温度は約120℃である。
(a)成分として、住友化学社製ボンドファースト2Cを200℃にて熱溶融させ、離型処理された金属板間に挟み込み、プレスし厚さ100μmのシートを成形した。また、このシートの25℃での伸張性は650%であり、溶融開始温度は約100℃である。
(b)成分は実施例2と同じものを用い、実施例2と同様に電子基板を包み込むように形成した。実施例2と同様に約100℃に加熱し、脱気シーラーで口部から空気を抜いて口部を熱圧着した。電子部品を包んだ保護シートを、紫外線照射機で30kJ/m 2 の紫外線を照射した。
Claims (3)
- (a)熱伸張性がASTM D638に規定される80℃での伸び率において150%以上であり、かつ、ポリオレフィン系アイオノマー及びエチレン−メタクリル酸共重合体(EMAA)より選ばれる成分、(b)前記(a)成分の熱溶融温度に対し20℃より低い温度での熱溶融性を有し、光照射することにより三次元架橋して硬化し、熱溶融性が無くなる成分、とを積層したことを特徴とする電子部品保護シート。
- 前記(a)成分の熱溶融温度が100℃より高いものである、請求項1に記載の電子部品保護シート。
- (a)熱伸張性が、ASTM D638に規定される80℃での伸び率において150%以上であり、かつ、ポリオレフィン系アイオノマー及びエチレン−メタクリル酸共重合体(EMAA)より選ばれる成分、(b)前記(a)成分の熱溶融温度に対し20℃より低い温度での熱溶融性を有し、光照射することにより三次元架橋して硬化し熱溶融性が無くなる成分、とを積層した電子部品保護シートを被保護部品である基板に当接させる工程、(a)成分が熱伸張性を示し、かつ(b)成分が熱溶融する温度に加熱して前記基板の凹凸に変形させる工程、光照射する工程、により基板に電子部品保護シートをコーティングすることを特徴とするコーティング方法。
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