Process for the preparation of a polypropylene molding...

Details Process for the preparation of a polypropylene molding... Process for the preparation of a polypropylene molding...

C - Chemistry, Metallurgy

08

F

400/2058

C08F 297/08 (2006.01) C08F 210/06 (2006.01) C08L 23/10 (2006.01) C08L 53/00 (2006.01)

Patent

CA 2032803

A propylene block copolymer having good flow properties and a very good low temperature impact strength is obtained in a high yield if a catalyst which consists of a chiral metallocene, containing a bridge, of the for- mula I (see formula I) and an aluminoxane is used for the polymerization of propylene and the comonomers. The polymerization is carried out in two stages, a crystalline propylene polymer in liquid monomers being prepared in the first stage and a copolymer in the gas phase being prepared in the second stage.

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