Bridged zirconocene compounds, process for their preparation and their use as catalyst components in the polymerization of olefins

A process for the polymerization of olefins comprising the reaction of polymerization of one or more olefinic monomers in the presence of a catalyst comprising the product obtained by contacting:

• (A) one or more bridged zirconocene compounds of formula (I),
• wherein R1, R2, R3 and R4, the same or different from each other, are selected from the group consisting of hydrogen, linear or branched, saturated or unsaturated, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl and C7-C20 arylalkyl radicals, optionally containing one or more Si or Ge atoms, or wherein two substituents of R1, R2, R3 and R4 form a ring having from 4 to 8 carbon atoms;
• R5 and R6, the same or different from each other, are selected from the group consisting of linear or branched, saturate or unsaturated C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl and C7-C20 arylalkyl radicals, optionally containing one or more Si or Ge atoms, or wherein two vicinal R6 substituents on the same indenyl group form a ring having from 4 to 8 carbon atoms;
• m is an integer ranging from 0 to 2;
• n is an integer ranging from 0 to 4;
• the groups X, the same or different from each other, are hydrogen, halogen, —R, —OR, —SR, —NR2 or —PR2, wherein R is selected from the group consisting of linear or branched, saturate or unsaturated, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl and C7-C20 arylalkyl radicals, optionally containing one or more Si or Ge atoms;
• and
• (B) a suitable activating cocatalyst.