Components and catalysts for the polymerization of olefins
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United States of America Patent
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Aug 28, 2001
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N/A
app pub date -
Jun 9, 1998
filing date -
Jun 9, 1997
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Abstract
The present invention relates to a solid catalyst component for the polymerization of olefins CH.sub.2.dbd.CHR in which R is hydrogen or a hydrocarbyl 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): ##STR1## wherein R.sub.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 alkylaryl group; R.sub.2 is a 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.sub.3 and R.sub.4 are independently selected from the group consisting of C.sub.1 -C.sub.3 alky, cyclopropyl, with the proviso that when R.sub.1 is C.sub.1 -C.sub.4 linear or branched alkyl or alkenyl, R.sub.2 is different from R.sub.1. Said catalyst components when used in the polymerization of olefins, and in particular of propylene, are capable to give high yields and polymers having high insolubility in xylene.
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