Patent ID: 6221803
Filing Date: 2001-04-24
Classification: C08F

Abstract:
A process for preparing a Ziegler-Natta catalyst, which process comprises:(i) mixing in a hydrocarbon solvent a dialkyl magnesium compound of general formula MgR.sup.1 R.sup.2 with a chlorinating agent soluble in the hydrocarbon solvent under conditions to precipitate a magnesium dichloride, wherein R.sup.1 and R.sup.2 are each independently a C.sub.1 to C.sub.10 alkyl group, and the chlorinating agent is obtained from the reaction between an alcohol of general formula R.sup.3 OH and an alkyl aluminum chloride of general formula R.sup.4.sub.n AlCl.sub.3-n, in which R.sup.3 OH is a cyclic or branched C.sub.3 to C.sub.20 alcohol, each R.sup.4 is independently a C.sub.2 to C.sub.8 alkyl and n is 1 or 2;(ii) removing unwanted reducing species; and(iii) titanating the magnesium dichloride with a chlorinated titanium compound to produce the Ziegler-Natta catalyst.