METHOD FOR PRODUCING POLYPROPYLENE

PROBLEM TO BE SOLVED: To provide a method for producing polypropylene, without having the problem that an inactivator used in a catalyst inactivating step is mixed in the recovered monomer or solvent and the activity of the catalyst is decreased when these recoveries are reused in polymerization. SO...

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Bibliographic Details
Main Authors HASHIZUME SATOSHI, MATSUMURA HIDEJI, ARAKI TAKAO
Format Patent
LanguageEnglish
Published 22.02.2007
Subjects
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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Summary:PROBLEM TO BE SOLVED: To provide a method for producing polypropylene, without having the problem that an inactivator used in a catalyst inactivating step is mixed in the recovered monomer or solvent and the activity of the catalyst is decreased when these recoveries are reused in polymerization. SOLUTION: The method for producing polypropylene comprises a polymerization step in which homopolymerization of polypropylene or copolymerization of polypropylene with another olefin is performed by a solvent polymerization method or a bulk polymerization method in the presence of a polymerization catalyst containing an organoaluminum compound, and an inactivating step in which inactivation of the polymerization catalyst is performed, wherein a specific diol compound having ≥500 molecular weight is added as the inactivator within a range of 50-1,000 mol% based on the organoaluminum compound. COPYRIGHT: (C)2007,JPO&INPIT
Bibliography:Application Number: JP20050234500