JP5368048B2 - 光反射性樹脂組成物、発光装置及び光学表示装置 - Google Patents
光反射性樹脂組成物、発光装置及び光学表示装置 Download PDFInfo
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Description
また、特許文献2には、発光素子をマウントする基体接合材として、銀ペーストの銀パウダーの代わりにアルミパウダーが混入されたアルミペーストが用いられた、発光ダイオードが記載されている。
(1)炭素−炭素不飽和結合を有しないエポキシ樹脂、エポキシ樹脂100質量部を基準にして40〜400質量部の酸化チタン、80〜160質量部の酸無水物系硬化剤、1〜5質量部のイミダゾール系硬化促進剤及び5〜30質量部の有機金属化合物を含む、光反射性樹脂組成物であって、
前記酸無水物系硬化剤が、下記式(1)で示される、光反射性樹脂組成物
(4)エポキシ樹脂が脂環式エポキシ樹脂である、上記(1)〜(3)のいずれかに記載の光反射性樹脂組成物。
(1)炭素−炭素不飽和結合を有しないエポキシ樹脂、
(2)エポキシ樹脂100質量部を基準にして40〜400質量部の酸化チタン、
(3)80〜160質量部の酸無水物系硬化剤、
(4)1〜5質量部のイミダゾール系硬化促進剤及び5〜30質量部の有機亜鉛化合物を含む、光反射性樹脂組成物であって、
(5)前記酸無水物系硬化剤が、下記式(1)で示される、光反射性樹脂組成物、である。
(エポキシ樹脂について)
(酸化チタンについて)
(酸無水物化合物について)
硬化物の着色を低減させた硬化物(変色の少ない硬化物)を得るため、配合物の構造中に含まれる炭素−炭素不飽和結合を低減させた酸無水物系硬化剤を用いることが好ましい。従来、このような用途において、ヘキサヒドロフタル酸無水物およびヘキサヒドロメチルフタル酸無水物、またはこれらの混合物(商標名、MH-700、新日本理化)が酸無水物として用いられた例がある。
本発明で用いる式(1)で示された酸無水物は、ビシクロ環構造を有するものであるため、室温付近における立体構造が著しく規制されている。
(硬化促進剤)
本発明では、硬化促進剤としては、イミダゾール系硬化剤と有機金属化合物、特に有機亜鉛化合物の組み合わせたものが好適である。
水素添加メチルナジック酸等の反応性の低い酸無水物系硬化剤を用いる本発明においては、他の硬化促進剤では短時間硬化を行うことが困難だからである。
また、その添加量は、併用するイミダゾール系硬化促進剤にもよるが、5〜30質量部の範囲で好適に添加できる。イミダゾール系硬化促進剤の併用により、この範囲で、樹脂組成物の短時間硬化(例えば、150℃1時間内の硬化が可能である。)が可能となり、高い接着力の確保(例えば、せん断接着強さが3MPa以上)できる。
(使用形態・実装形態について)
実施例1
第2表に記載のように、100質量部の脂環式エポキシ樹脂(CEL2021P)、120質量部の水酸化メチルナジック酸無水物(HNA−100)、3質量部のイミダゾール系硬化促進剤(2E4MZ−CN)、15質量部のステアリン酸亜鉛(Zn Stearate)及び160質量部のアナターゼ型酸化チタン(A−220)で計量し、混合容器(容量0.1L)内でコンデイショニングミキサーで攪拌混合した。得られた樹脂組成物のペーストを150μmの厚さでガラスプレート上に塗布し、150℃で1時間にわたって硬化させた。約150μmの厚さをもった樹脂組成物シートが得られた。
前記実施例1に記載の手法を繰り返したが、本例では、原材料の種類及び配合量を第2表に記載するように変更した。実施例1と同様な手法に従って混合、塗布及び硬化を行い、約0.15mmの厚さをもった樹脂組成物シートを得た。
前記実施例1に記載の手法を繰り返したが、本例では、比較のため、原材料の種類及び配合量を第2表に記載するように変更した。実施例1と同様な手法に従って混合、塗布及び硬化を行い、約150μmの厚さをもった樹脂組成物シートを得た。
前記実施例1〜4、比較例1〜5において調整した樹脂組成物シートを供試サンプルとして使用した。下記の手順に従って(1)せん断接着強さ(MPa)、(2)400nm及び460nmにおける初期反射率(%)、(3)400nm及び460nmにおける高温経時後の反射率(%)、(4)可使時間(ポットライフ)を測定した。
JIS K6850に準拠して、せん断接着強さ試験(OLSS)を実施した。この試験で使用した試験片(1.6mmx25mmx50mm)は、銀メッキ銅版(メッキ厚3〜5μm)、接着面積は12.5mmx25mm、表面脱脂方法はメチルエチルケトン(MEK)脱脂、接着剤硬化条件は150℃で1時間、引張速度は5mm/分であった。せん断接着強さが3MPa以上の場合を、合格とした。結果を第2表に示す。
以下に記載した方法に従って初期反射率の測定を行った。ガラスプレート上で調製された厚さ0.15mmの樹脂組成物シートをサンプルとしてそのまま使用し、そして、測定機器として、スペクトロフォトメーターU−4100(日立社製)を用いた。尚、反射率の測定は、2種類の波長(400nm及び460nm)の光について実施した。結果を第2表に示す。
以下に記載した方法に従って高温(150℃)で500時間経過後の反射率の測定を実施した。ガラスプレート上で調製された厚さ約0.15mmの樹脂組成物シートをサンプルとしてそのまま使用し、そして測定機器として、スペクトロフォトメーターU−4100(日立社製)を用いた。尚、反射率の測定は、波長400nmの光について実施した。結果を第2表に示す。
以下に記載した方法に従って可使時間(ポットライフ)の測定を実施した。実施例、比較例の各硬化前の樹脂組成物のペーストを、ギャップ0.1mmの隙間に取り、測定温度25℃、シェアレート200(1/S)の条件で、ロトビスコ回転粘度計(ハーケ社製)を用いて、初期粘度が、その2倍になるまでの時間を測定した。 結果を第2表に示す。
2 酸化チタン
3 基板
4 発光素子
5 封止樹脂
10 発光装置
11 光反射層
L1 放射光
L2 反射光
Claims (8)
- R2、R3は、いずれか一方は、メチル基であり、他方は、水素である、また、R1,R4は、いずれも水素である式(1)に示される酸無水物系硬化剤を有する、請求項1記載の光反射性樹脂組成物からなる発光素子の接合材。
- 前記エポキシ樹脂が脂環式エポキシ樹脂である、請求項1〜2のいずれか1項に記載の光反射性樹脂組成物からなる発光素子の接合材。
- 前記酸化チタンがアナターゼ型酸化チタンである、請求項1〜3のいずれか1項に記載の光反射性樹脂組成物からなる発光素子の接合材。
- 基板と発光素子とを有し、基板と発光素子とが請求項1〜4のいずれか1項に記載の樹脂組成物からなる発光素子の接合材を介して接合されている、発光装置。
- 基板と、基板表面に設けられた請求項1〜4のいずれか1項に記載の樹脂組成物からなる発光素子の接合材からなる光反射層と、発光素子とを有し、基板と発光素子とが光反射層を介して接合されている、発光装置。
- 前記発光素子がLEDチップであり、前記発光装置が発光ダイオードである、請求項5もしくは、6記載の発光装置。
- 請求項1〜4のいずれか1項に記載の樹脂組成物からなる発光素子の接合材を用いて接合又はシールされた部材を含む、光学表示装置。
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