Patent ID: 6281301
Filing Date: 2001-08-28
Classification: C08F

Abstract:
A solid catalyst for the polymerization of olefins CH.sub.2.dbd.CHR in which R is hydrogen or a hydrocarbon radical with 1-12 carbon atoms, comprising a titanium compound, having at least a Ti-halogen bond and an electron donor compound supported on a Mg halide, in which said electron donor compound is selected from esters of malonic acids of formula (I): ##STR7##wherein R.sup.1 is a C.sub.1 -C.sub.20 linear or branched alkyl, C.sub.3 -C.sub.20 alkenyl, C.sub.3 -C.sub.20 cycloalkyl, C.sub.6 -C.sub.20 aryl, arylalkyl or akylaryl group; R.sup.2 is C.sub.1 -C.sub.20 linear alkyl, C.sub.3 -C.sub.20 linear alkenyl, C.sub.6 -C.sub.20 aryl, arylalkyl or alkylaryl group; R.sup.3 and R.sup.4 are independently selected from the group consisting of C.sub.1 -C.sub.3 alkyl, cyclopropyl, with the proviso that when R.sub.1 is C.sub.1 -C.sub.4 linear or branched alkyl or alkenyl, R.sup.2 is different from R.sub.1.