Patent ID: 7005487

Claim:
A solid catalyst component for the polymerization of olefins of formula CH 2 =CHR, in which R is hydrogen or a hydrocarbyl radical with 1–12 carbon atoms, comprising: an inert porous support, Mg, Ti, halogen and an electron donor selected from succinates of formula (I): wherein the radicals R 1 and R 2 , equal to or different from each other, are a linear or branched, saturated or unsaturated C 1 –C 20 alkyl, C 3 –C 20 cycloalkyl, C 6 –C 20 aryl, C 7 –C 20 alkylaryl or C 7 –C 20 arylalkyl radical, optionally containing heteroatoms belonging to groups 13–17 of the Periodic Table of the Elements; the radicals R 3 , R 4 , R 5 and R 6 , equal to or different from each other, are hydrogen or a linear or branched, saturated or unsaturated C 1 –C 20 alkyl, C 3 –C 20 cycloalkyl, C 6 –C 20 aryl, C 7 –C 20 alkylaryl or C 7 –C 20 arylalkyl radical, optionally containing heteroatoms belonging to groups 13–17 of the Periodic Table of the Elements; and the radicals R 3 , R 4 , R 5 and R 6 which are joined to the same carbon atom can be linked together to form a C 3 –C 8 ring; wherein the inert porous support is a metal oxide present in quantities greater than 40% by weight with respect to the total weight of the component.