Patent ID: 8835578

Claim:
A catalyst component for the polymerization of olefins comprising: Mg, Ti, a halogen, a first internal electron donor and a second internal electron donor wherein the first internal electron donor and the second internal electron donor are two different electron donor compounds wherein the first internal electron donor is selected from compositions 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 the R 2 is —OR 1 ; and the second internal electron donor is a 1,3-diether selected from those of formula (II): where R I and R II are the same or different and are hydrogen or linear or branched C 1 -C 18 hydrocarbon groups which can also form at least one cyclic structure; R III groups, equal or different from each other, are hydrogen or C 1 -C 18 hydrocarbon groups; R IV groups equal or different from each other, have the same meaning of R III except that they cannot be hydrogen; and each of the R I to R IV groups can contain heteroatoms selected from halogens, N, o, S or Si.