Borealis reveals new polypropylene process

Borealis AS, Copenhagen, has launched a proprietary process for making polypropylene and will use it in a new plant at Schwechat, Austria. The Borstar PP process is claimed to produce improved polypropylene grades for high-volume applications and to open new applications as a replacement for polyvinyl chloride and styrenic polymers. Borstar PP uses a proprietary Ziegler-Natta catalyst in a loop reactor configured in cascade with one to three gas-phase reactors. Borealis said the reactors are operated independently, enabling tailoring of molecular weight distribution. "The gas phase reactor," said Borealis, "enables higher comonomer content in the polymer. The technology i...

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