Process for continuously producing propylene-based block copolymer
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United States of America Patent
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Jan 12, 1999
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N/A
app pub date -
Apr 16, 1997
filing date -
Apr 18, 1996
priority date (Note) -
Expired
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Abstract
A process for continuously producing a propylene-based block copolymer having an excellent impact resistance of the present invention, comprises: a first polymerization step comprising polymerizing .alpha.-olefin comprising propylene in the presence of hydrogen and a stereoregular polymerization catalyst comprising a solid catalyst component containing magnesium, titanium, halogen atom and an electron-donor compound, an organoaluminum compound and, if required, an electron-donar compound in a single polymerization reactor; and a second polymerization step comprising transporting .alpha.-olefin polymer obtained in the first polymerization step to a copolymerization reactor and copolymerizing propylene with .alpha.-olefin other than propylene in a gas phase substantially in the presence of said stereoregular polymerization catalyst used in the first polymerization step.
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