PRODUCTION OF ALPHA-OLEFIN BLOCK COPOLYMER

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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Hauptverfasser: NISHIMURA TOSHIHIKO, YOSHIMATSU HISASHI, TANAKA KATSUNORI, ASAEDA EITAROU
Format: Patent
Sprache:eng
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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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creator NISHIMURA TOSHIHIKO
YOSHIMATSU HISASHI
TANAKA KATSUNORI
ASAEDA EITAROU
description 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%.)
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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
title PRODUCTION OF ALPHA-OLEFIN BLOCK COPOLYMER
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