Patent ID: 7351778

Claim:
A catalyst component for olefin polymerization, comprising magnesium, titanium, a halogen and an electron donor compound (a), wherein said electron donor compound (a) is at least one selected from the group consisting of dibasic ester compounds of the formula (I): wherein R 1 and R′ groups, which may be identical or different, are selected from the group consisting of substituted or unsubstituted, C 1 -C 20 linear or branched alkyl, C 3 -C 20 cycloalkyl, C 6 -C 20 aryl, C 7 -C 20 alkaryl, C 7 -C 20 aralkyl, C 2 -C 10 alkenyl, and C 10 -C 20 condensed aromatic group; A is a bivalent linking group with chain length between two free radicals being 1-10 carbon atoms, where one or more carbon atoms of the bivalent linking group are optionally replaced by a hetero-atom selected from the group consisting of nitrogen, oxygen, sulfur, silicon, and phosphorus, and one or more carbon atoms and optional hetero-atom(s) of the bivalent linking group optionally carry a substituent selected from the group consisting of linear or branched alkyl, cycloalkyl, aryl, alkaryl, aralkyl, alkenyl, condensed aromatic group, and ester group, said substituents having from 1 to 20 carbon atoms, and two or more of said substituents being optionally linked together to form a saturated or unsaturated monocyclic or polycyclic ring.