摘要:
The present invention relates to a method for producing a mixture of a Ziegler-type catalyst formulation comprising a transition metal component, an external electron donor component, and a cocatalyst component to be charged to a polymerization reactor.
摘要:
The present invention relates to a method for producing a mixture of a Ziegler-type catalyst formulation comprising a transition metal component, an external electron donor component, and a cocatalyst component to be charged to a polymerization reactor.
摘要:
The invention is for a catalyst system, a process for making the catalyst system and a process for olefin polymerization using the catalyst system. The catalyst system comprises alcohol or diethylaluminum alkoxide added to a conventional Ziegler-Natta catalyst component, an aluminum alkyl co-catalyst and, optionally, an electron donor. The aluminum alkyl is preferably triethyl aluminum Addition of alcohol in a range of from 0.03 to 0.25 results in a increase in catalyst efficiency and polymerization yield. Normal or linear chain alcohols, such as methanol and ethanol, seem to have a positive effect whereas branched alcohols appears to have no positive effect. The mole-to-mole ratio of diethylaluminum alkoxide to aluminum alkyl ranges from 0.05 to 0.2. This invention is effective for the aluminum/transition metal ratio for the polymerization of olefins ranges from about 100 to about 500. Polymerization yield increases of greater than 10% are realized. The diethylaluminum alkoxide is preferably diethylaluminum ethoxide.