Process for controlling morphology of Ziegler-Natta catalysts

Details Process for controlling morphology of Ziegler-Natta catalysts Process for controlling morphology of Ziegler-Natta catalysts

2007-07-16

2011-11-22

Wu, David W (Department: 1762)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

Reexamination Certificate

active

08063159

ABSTRACT:
Disclosed is a process for making a Ziegler-Natta catalyst having controlled particle size and distribution. It comprises altering the precipitation of a catalyst component from a catalyst synthesis solution including a soluble magnesium containing catalyst precursor by controlling the concentration of either the soluble magnesium containing catalyst precursor, wherein the average particle size of the catalyst component is increased, and the particle size distribution increased, with a decreased concentration of the soluble magnesium containing catalyst precursor; or of the precipitating agent, wherein the average particle size of the catalyst component is increased, and the particle size distribution increased with an increased concentration of the precipitating agent. Use of the invention enables improved catalyst consistency regardless of production scale and customizing of catalyst morphology to desired polymer morphology. The novel catalyst components may be used to prepare polymers, and end-use articles therefrom, having desirable properties.

REFERENCES:
patent: 2005/0085601 (2005-04-01), Vizzini et al.
patent: WO2005/032714 (2005-04-01), None

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