JP2006321939A - 光拡散性部材用樹脂組成物およびそれを用いた光拡散性部材 - Google Patents
光拡散性部材用樹脂組成物およびそれを用いた光拡散性部材 Download PDFInfo
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- JP2006321939A JP2006321939A JP2005148073A JP2005148073A JP2006321939A JP 2006321939 A JP2006321939 A JP 2006321939A JP 2005148073 A JP2005148073 A JP 2005148073A JP 2005148073 A JP2005148073 A JP 2005148073A JP 2006321939 A JP2006321939 A JP 2006321939A
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Abstract
【解決手段】 芳香族ポリカーボネート樹脂(A)及び帯電防止剤を含浸させた、重量平均粒径が0.7〜30μmで、ポリカーボネート樹脂との屈折率差(Δn)が0.01以上であり、且つ、ポリカーボネート樹脂と非相溶性の拡散微粒子(B)を含有してなる光拡散性樹脂組成物。
【選択図】 なし
Description
本発明に使用されるポリカーボネート樹脂は、芳香族ジヒドロキシ化合物又はこれと少量のポリヒドロキシ化合物と、ホスゲンとの界面重合法により得られるか、または、上記の芳香族ジヒドロキシ化合物又はこれと少量のポリヒドロキシ化合物と、炭酸ジエステルとのエステル交換反応により得られる、分岐していてもよい芳香族ポリカーボネート重合体である。
また、本発明で使用するポリカーボネート樹脂は2種以上の混合物であってもよい。
特に特許文献4記載の下記一般式(1)で示されるポリアルキレングリコールモノフェノールエーテル構造を有する単量体ユニットを含有する重合体と、有機アニオン化合物を組み合わせた帯電防止剤が好ましい。
また、本発明の光拡散性部材には、光拡散性を上げるために、公知の方法でエンボス加工、V溝加工、畝状加工等の凹凸加工を表面に施しても良い。これらの加工を施すことにより、光拡散性を保持したまま、光拡散微粒子の添加量を減らすことができる。
(1)粘度平均分子量:
ウベローデ粘度計を用いて塩化メチレン中20℃で極限粘度[η]を測定し、以下の式より求めた。
(2)色相(YI)及び全光線透過率、ヘイズ:
実施例または比較例の組成物から成形された2mm厚の試験片を用い、分光式色彩計(日本電色工業社製「SE−2000型」)によりYIを測定した。また、濁度計(日本電色工業社製「NDH−2000型」)を使用して全光線透過率、およびヘイズを測定した。
実施例または比較例の組成物から成形された2mm厚の試験片を用いて測定した輝度値を用い、下式により求めた。輝度値の測定はMURAKAMI COLOR RESEARCH LABORATORY社製のGP−5 GONIOPHOTOMETERを使用した。測定条件は、入射光0°、あおり角0°、受光範囲0°〜90°、光束絞り2.0、受光絞り3.0で行った。
実施例または比較例の組成物を用い、射出成形機(名機社製「M150」)により、300℃の温度で成形したプレート(φ100mm×3.2mm厚)を試験片とし、23℃、50%RHにて1週間調湿した後、および、水洗した直後に、それぞれ、試験片の表面抵抗をADVANTEST社製デジタル超高抵抗/微少電流計R8340を用いて測定した。
ASTM D256に準じて、実施例または比較例の組成物から成形した3.2mm厚、ノッチ付きの試験片を用い、東洋精機製作所社製測定装置を使用して測定した。
表2に示す割合で各原料をブレンドした後、スクリュー径40mmのベント付単軸押出機(田辺プラスチックス機械社製「VS−40」)により、シリンダー温度250℃で溶融混練し、ストランドカットによりペレットを得た。得られたペレットを120℃で5〜7時間、熱風循環式乾燥機により乾燥した後、射出成形機(日本製鋼所社製「J50」)により、300℃の温度で90mm×50mm×2mm厚のプレートを成形し、上記の評価を行なった。その結果を表2に示した。
比較例3〜6はシリカの粒径、帯電防止剤の種類や量を変更したが、何れもシリカと帯電防止剤を別個に用いた場合は、透過率と拡散率の関係、或いは、透過率、YI値、抵抗値、アイゾット衝撃値等が、実施例組成物に及ばない。
Claims (5)
- 芳香族ポリカーボネート樹脂(A)及び帯電防止剤を含浸させた、重量平均粒径が0.7〜30μm、ポリカーボネート樹脂との屈折率差(Δn)が0.01以上、且つ、ポリカーボネート樹脂と非相溶性の拡散微粒子(B)を含有してなる光拡散性部材用樹脂組成物。
- 拡散微粒子(B)の含有量が、芳香族ポリカーボネート樹脂(A)100重量部に対し、1〜10重量部である請求項1記載の光拡散性部材用樹脂組成物。
- 拡散微粒子(B)が帯電防止剤を含浸させたシリカ粒子である請求項1又は2に記載の光拡散性部材用樹脂組成物。
- 請求項1〜4のいずれか1項に記載の樹脂組成物から形成された光拡散性部材。
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JPH09227785A (ja) * | 1995-12-20 | 1997-09-02 | Asahi Chem Ind Co Ltd | 樹脂組成物及びその成形体 |
JP2002060734A (ja) * | 2000-06-09 | 2002-02-26 | Asahi Denka Kogyo Kk | 帯電防止性組成物 |
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JPH0333162A (ja) * | 1989-06-30 | 1991-02-13 | Mizusawa Ind Chem Ltd | 樹脂用配合剤組成物 |
JPH09227785A (ja) * | 1995-12-20 | 1997-09-02 | Asahi Chem Ind Co Ltd | 樹脂組成物及びその成形体 |
JP2002060734A (ja) * | 2000-06-09 | 2002-02-26 | Asahi Denka Kogyo Kk | 帯電防止性組成物 |
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