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

Filed on

1992-10-13

Date issued

1994-01-18

Examiner

Schofer, Joseph L.

Patent Class

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

SubClass

Synthetic resins

SubSubClass

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

Other Related Categories

525247, 525323, C08L 2306

Type

Patent

Status

active

Patent number

052800741

Description

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 in liquid monomers being prepared in the first stage and a copolymer in the gas phase being prepared in the second stage.

REFERENCES:
patent: 4739015 (1988-04-01), Toyota et al.
patent: 5086134 (1992-02-01), Antberg et al.

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