Patent ID: 8829126

Claim:
A catalyst component for the polymerization of olefins comprising Mg, Ti, halogen and two internal electron donor compounds, one of which is selected from those of formula (I): wherein: R 2 , equal to or different from each other, are hydrogen atoms or C 1 -C 20 hydrocarbon radicals optionally containing heteroatoms belonging to groups 13-17 of the periodic table of the elements or alkoxy groups of formula —OR 1 , and at least two of the R 2 groups can be connected together to form a cycle; R 1 groups, equal to or different from each other, are C 1 -C 20 hydrocarbon radicals optionally containing heteroatoms belonging to groups 13-17 of the periodic table of the elements, with the proviso that at least one of R 2 is —OR 1 and the other being selected from succinates of formula (II): wherein the radicals R I and R II , equal to or different from each other, are a C 1 -C 20 linear or branched alkyl, alkenyl, cycloalkyl, aryl, arylalkyl or alkylaryl group, optionally containing heteroatoms; the radicals R III to R VI equal to or different from each other, are hydrogen or a C 1 -C 20 linear or branched alkyl, alkenyl, cycloalkyl, aryl, arylalkyl or alkylaryl group, optionally containing heteroatoms, and the radicals R III to VI which are joined to the same carbon atom of the succinate chain can be linked together to form a cycle.