PROPYLENE-BASED BLOCK COPOLYMER

PROBLEM TO BE SOLVED: To prevent defective molding of a flow mark and improve appearance of a molded article.SOLUTION: A propylene-based block copolymer consisting of 80 to 60 wt.% of a crystalline propylene polymer part having the intrinsic viscosity [ ]p of 0.90 dl/g or less, 35 to 50 wt.% of ethy...

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Bibliographische Detailangaben
Hauptverfasser:	HOSOI TOMOHIRO, OSADA MASAHIRO, RYOSHO YUJI, MIZUKAMI SHIGEO, NAKAYAMA KOICHI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To prevent defective molding of a flow mark and improve appearance of a molded article.SOLUTION: A propylene-based block copolymer consisting of 80 to 60 wt.% of a crystalline propylene polymer part having the intrinsic viscosity [ ]p of 0.90 dl/g or less, 35 to 50 wt.% of ethylene content and 20 to 40 wt.% of a propylene ethylene random copolymer part having the intrinsic viscosity [ ]c of 7.0 dl/g or more ([ ]c/[ ]p is 7.5 to 30) and having MFR of 10 to 50 g/10 min. is used as an appearance improver. 【課題】フローマークの成形不良を防ぎ、成形品の外観を改良する。【解決手段】固有粘度［］ｐが０．９０ｄｌ／ｇ以下の結晶性プロピレン重合体部分８０〜６０重量％と、エチレン含有量が３５〜５０重量％、固有粘度［］ｃが、７．０ｄｌ／ｇ以上（ただし［］ｃ／［］ｐは、７．５〜３０である。）のプロピレン・エチレンランダム共重合体部分２０〜４０重量％とからなり、ＭＦＲが、１０〜５０ｇ／１０分であるプロピレン系ブロック共重合体を外観改良材として用いる。【選択図】なし