POLYPROPYLENE COMPOSITION WITH LOW LINEAR THERMAL EXPANSION AND LOW DENSITY CHARACTER

PURPOSE: A polypropylene resin composition is provided to reveal hardness while having small amount of inorganic filler contents and to secure the size stability of segments by minimizing changes in balanced properties, especially linear expansion followed by thermal change. CONSTITUTION: A polyprop...

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Hauptverfasser:	KANG, HEE WOO, HONG, JONG SOO, HAN, JOUNG HWAN, YOO, YOUNG SUNG, LIM, JAE GON
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS 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:	PURPOSE: A polypropylene resin composition is provided to reveal hardness while having small amount of inorganic filler contents and to secure the size stability of segments by minimizing changes in balanced properties, especially linear expansion followed by thermal change. CONSTITUTION: A polypropylene resin composition comprises 70-98 weight % of a highly crystalline polypropylene resin with more than 96% of isotactic peptide fraction by C-NMR method; and 1-20 weight % of rubber component; and 1-10 weight% of inorganic filler. The highly crystalline polypropylene resin is the polypropylene resin of a highly crystalline block copolymer. The rubber component is 'more than one selected from an armorphous ethylene α-olefin copolymer and styrene thermoplastic elastomer'. The inorganic filler is 'more than one selected from glass fiber, talc, mica, calcium carbonate, wollastonite, barium sulfate, clay, magnesium sulfate and whisker'.