Two-stage process for producing polypropylene compositions

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United States of America Patent

PATENT NO 9994656
SERIAL NO

14914865

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A process for polymerizing propylene in the presence of a polymerization catalyst by polymerizing propylene with a comonomer selected from the group of ethylene and C4-C10 alpha-olefins in two polymerization stages where the comonomer is present in at least one of the polymerization stages. The first polymerization stage is conducted in a loop reactor and the second polymerization stage in a gas phase reactor. The polymer produced in first polymerization stage has a higher melt flow rate and a lower content of comonomer units than the final polymer mixture. The process can be operated with a high throughput and catalyst productivity. The polymers are useful for making films.

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BOREALIS AGVIENNA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Alastalo, Kauno Porvoo, FI 41 402
Vestberg, Torvald Porvoo, FI 41 381

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