Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1993-03-30
1995-05-09
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526125, 526128, 526351, 526901, C08F 234
Patent
active
054140633
ABSTRACT:
A process control scheme for temporarily slowing or killing the production of polypropylene while idling the reactor using a fourth generation catalyst system containing a solid magnesium chloride supported titanium tetrachloride catalyst component containing an internal strong electron donor in combination with a silicon compound, and an organoaluminum compound (cocatalyst) is disclosed. This process entails the introduction of an amount of an external strong electron donor to the ongoing polymerization reaction. The polymerization reaction can be restarted by introducing an additional amount of the organoaluminum compound.
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Haight LeVoy G.
Liu Yao-Ching
Pagan Luis A.
Payne Kimberly R.
Seeger Horst K.
Brown Ron D.
Huntsman Polypropylene Corporation
Schofer Joseph L.
Stolle Russell R.
Wu David
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