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

1995-06-05

1998-01-13

Wu, David W.

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

Synthetic resins

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

525247, 525270, 525322, C08L 2306

Patent

active

057080909

ABSTRACT:
Process for the preparation of a polypropylene molding composition
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.

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patent: 5086134 (1992-02-01), Antberg et al.
patent: 5212247 (1993-05-01), Asanuma et al.

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