JP5454630B2 - 異形押出成形用ポリカーボネート樹脂組成物及び緩衝材 - Google Patents
異形押出成形用ポリカーボネート樹脂組成物及び緩衝材 Download PDFInfo
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- JP5454630B2 JP5454630B2 JP2012150192A JP2012150192A JP5454630B2 JP 5454630 B2 JP5454630 B2 JP 5454630B2 JP 2012150192 A JP2012150192 A JP 2012150192A JP 2012150192 A JP2012150192 A JP 2012150192A JP 5454630 B2 JP5454630 B2 JP 5454630B2
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- RXOHFPCZGPKIRD-UHFFFAOYSA-N naphthalene-2,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)O)=CC=C21 RXOHFPCZGPKIRD-UHFFFAOYSA-N 0.000 description 1
- WPUMVKJOWWJPRK-UHFFFAOYSA-N naphthalene-2,7-dicarboxylic acid Chemical compound C1=CC(C(O)=O)=CC2=CC(C(=O)O)=CC=C21 WPUMVKJOWWJPRK-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Description
従って異形押出成形時、特に押出機から吐出された溶融樹脂に所望の形状を付与しながら冷却させる機能を有するサイジングダイを用いた成形時には、ドローダウンが大きくなる等、溶融張力不足となる傾向が強い。
芳香族ポリカーボネート樹脂は、周知のように、芳香族ジヒドロキシ化合物をホスゲンと反応させる界面重合法や、炭酸ジエステルと反応させるエステル交換法により製造されているが、本発明では何れの製造法のものも用いることができる。エステル交換法では末端封止剤を反応させて末端OH基濃度を調節することがあるが、この処理を経たものも用いることができる。
表1に示す割合で各成分を配合し、タンブラーミキサーで均一に混合した後、二軸押出機(日本製鋼所社製、TEX30XCT、L/D=42、バレル数12)を使用し、シリンダー温度280℃、スクリュー回転数250rpmにてバレル1より押出機にフィードして溶融混練することにより、樹脂組成物のペレットを作製した。
上記で得られたペレットを120℃で4時間以上乾燥し、東洋精機製「キャピログラフ1C」を用い、シリンダー温度260℃、オリフィス径φ1.0mm、長さ10mm、ピストン降下速度10mm/min、ストランド引き取り速度3.8m/minにて溶融張力を測定した。結果を表1に示す。尚、当該測定装置における溶融張力の測定下限は15mNであり、一般的に、押出成形に用いる樹脂組成物の実用的な溶融張力は、20mN以上である。
上記で得られたペレットを120℃で4時間以上乾燥した後、ファナック製「α100iA型」射出成形機を使用して、シリンダー温度280℃、金型温度80℃、成形サイクル40秒の条件で、ISO引張試験片(厚さ4.0mm)を射出成形した。ISO 179に準拠して、この試験片から厚さ4.0mmのノッチ付試験片を作製し、23℃及び−30℃の環境下において、ノッチ付きシャルピー衝撃強度(単位:KJ/m2)を測定した。結果を表1に示す。
上記と同じ方法でISO引張試験片(厚さ4mm)を作製し、これに0.59%の撓みを負荷した状態で、試験薬品を塗布し、室温下72時間保持した。このものについて目視及びマイクロスコープを使用してクラック発生度合いを調べ、耐薬品性を評価した。試験薬品としては市販のレギュラーガソリンを使用した。なおクラック発生度合いは、試験片5本のうちクラックの発生した本数の割合により、評価した。結果を表1に示す。
Claims (8)
- 粘度平均分子量が26000以上40000以下の芳香族ポリカーボネート樹脂(A)100重量部に対し、結晶性ポリエステル樹脂(B)20〜100重量部、熱可塑性エラストマー(C)0.5〜40重量部、並びに芳香族ビニル化合物の重合体であって且つポリカーボネートと反応する官能基を有する重合体(D)0.5〜20重量部を含有することを特徴とする異形押出成形用ポリカーボネート樹脂組成物。
- 重合体(D)がポリカーボネートと反応する官能基としてエポキシ基を有していることを特徴とする請求項1に記載の異型押出成形用ポリカーボネート樹脂組成物。
- 結晶性ポリエステル樹脂(B)が、ポリエチレンテレフタレート樹脂及びポリブチレンテレフタレート樹脂より成る群から選ばれるものであることを特徴とする請求項1又は2に記載の異型押出成形用ポリカーボネート樹脂組成物。
- 結晶性ポリエステル樹脂(B)が、フェノールとテトラクロルエタンの等重量混合溶媒を用い、25℃で測定した固有粘度が0.4〜2.0dl/gのものであることを特徴とする請求項3に記載の異型押出成形用ポリカーボネート樹脂組成物。
- 熱可塑性エラストマー(C)がコア/シェル型グラフト共重合体であることを特徴とする請求項1ないし4の何れかに記載の異型押出成形用ポリカーボネート樹脂組成物。
- 重合体(D)がポリカーボネートと反応する官能基としてエポキシ基を有しており、かつそのエポキシ当量が100〜600g/eqであることを特徴とする請求項1ないし5の何れかに記載の異型押出成形用ポリカーボネート樹脂組成物。
- 重合体(D)がモノマーとしてスチレン及びグリシジル(メタ)アクリレートを用いて製造されたものであり、且つその含有量が0.5〜5重量部であることを特徴とする請求項1ないし6の何れかに記載の異型押出成形用ポリカーボネート樹脂組成物。
- 請求項1ないし7の何れかに記載のポリカーボネート樹脂組成物を押出成形して成り、断面形状が円筒形、楕円筒形、四角筒形又はコの字状であることを特徴とする緩衝材。
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