PRODUCTION OF ALPHA-OLEFIN BLOCK COPOLYMER

PURPOSE:To obtain the titled block copolymer efficiently, by adding an aluminum alkoxide to polypropylene particles containing a specified proportion of an organoaluminum compound left unseparated on purpose and copolymerizing these particles with a different olefin in the vapor phase. CONSTITUTION:...

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Bibliographische Detailangaben
Hauptverfasser:	NISHIMURA TOSHIHIKO, YOSHIMATSU HISASHI, TANAKA KATSUNORI, ASAEDA EITAROU
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain the titled block copolymer efficiently, by adding an aluminum alkoxide to polypropylene particles containing a specified proportion of an organoaluminum compound left unseparated on purpose and copolymerizing these particles with a different olefin in the vapor phase. CONSTITUTION:Propylene is polymerized in the presence of a catalyst containing titanium trichloride and an organoaluminum compound (e.g., diethylaluminum chloride), and then the produced polypropylene particles are separated so that the amount of the organoaluminum compound left in the polypropylene particles may be 10-150ppm (calculated as Al). Then, after adding an aluminum alkoxide (e.g., ethylaluminum diethoxide), these particles are copolymerized with a different alpha-olefin (e.g., ethylene/propylene monomer mixture) in the vapor phase under conditions including a temperature of about 30-100 deg.C and a pressure of 1-50kg/ cm . (The proportion of the alpha-olefin block segments is preferably about 3- 50wt%.)