PREPARATION OF MOLDED ARTICLE OF POLYPROPYLENE

PURPOSE:To obtain the titled molded article for preventing completely occurrence of unevenness in surface gloss, by using a polypropylene having >= a specific amount of molecular weight distribution shown by a ratio of weight-average molecular weight to number-average molecular weight. CONSTITUTI...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	MITANI KATSUO, ASAEDA EITAROU
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS 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 WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain the titled molded article for preventing completely occurrence of unevenness in surface gloss, by using a polypropylene having >= a specific amount of molecular weight distribution shown by a ratio of weight-average molecular weight to number-average molecular weight. CONSTITUTION:The desired molded article is obtained by using a polypropylene having a ratio (Mw/Mn) of weight-average molecular weight Mw to number- average molecular weight Mn of >=6, preferably 7-8. The polypropylene is preferably obtained by microblend method wherein an amount of a molecular weight modifier present during polymerization is changed stepwise and molecular weight distribution of formed polymer is adjusted. EFFECT:Effective especially for injection molding.