Process for the preparation of a polypropylene molding compositi

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

1990-12-19

1994-06-21

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525268, 525270, 525323, C08F29708

Patent

active

053229029

ABSTRACT:
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 formula I ##STR1## 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 being prepared in the first stage.

REFERENCES:
patent: 4576994 (1986-03-01), Dorrer et al.
patent: 5086134 (1992-02-01), Antberg et al.

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