Method for preparing a Ziegler-Natta catalyst

Details Method for preparing a Ziegler-Natta catalyst Method for preparing a Ziegler-Natta catalyst

2011-05-03

2011-05-03

Wu, David (Department: 1762)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Plural component system comprising a - group i to iv metal...

C502S110000, C502S133000, C502S158000, C502S232000, C526S124400, C526S124500, C526S124600, C526S124800, C526S124900, C526S128000

Reexamination Certificate

active

07935651

ABSTRACT:
A method for preparing a titanium-containing Ziegler-Natta catalyst is disclosed. A dialkyl magnesium compound, a trialkyl aluminum compound, and a polymethylhydrosiloxane are first combined in a hydrocarbon solvent. That product is then combined with dry, alcohol-free magnesium chloride. A solid product from the reaction with the magnesium chloride component is isolated and washed with a hydrocarbon solvent. The washed solid product is then combined with an alkyl aluminum dichloride or a dialkyl aluminum chloride to give the catalyst. The catalyst is suitable for both slurry and gas-phase olefin polymerizations. Polyolefins produced with the catalyst have broad molecular weight distributions and narrow distributions of relatively large particles.

REFERENCES:
patent: 4464518 (1984-08-01), Iwabuchi et al.
patent: 4511669 (1985-04-01), Gessell
patent: 4518706 (1985-05-01), Gessel
patent: 2009/0306316 (2009-12-01), Morini et al.
patent: WO-95/06672 (1995-03-01), None
patent: WO 95/06672 (1995-03-01), None

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