POLYPROPYLENE RESIN COMPOSITION, PRECISION-INJECTION-MOLDED OBJECT, MOLD FOR MOLDING OPTICAL MEMBER, AND PROCESS FOR PRODUCING OPTICAL MEMBER

Disclosed is a polypropylene resin composition which contains a polypropylene-based polymer containing, as monomer units, propylene and at least one copolymerization monomer of ethylene or ±-olefins with carbon atom number of 4 or more. Proportion of the monomer units derived from the copolymerizati...

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Bibliographische Detailangaben
Hauptverfasser:	SHIBATA, Mariko, IGAWA, Nao
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	Disclosed is a polypropylene resin composition which contains a polypropylene-based polymer containing, as monomer units, propylene and at least one copolymerization monomer of ethylene or ±-olefins with carbon atom number of 4 or more. Proportion of the monomer units derived from the copolymerization monomer in the polypropylene-based polymer is 2 to 10% by mass based on the mass of the polypropylene-based polymer. A crystallization half-time at 110°C of the polypropylene resin composition is 20 seconds or shorter.