Patent ID: 7081505

Claim:
An organometallic composition which can be used as activating component in a metallocene catalyst for the (co)polymerization of α-olefins, comprising the following three components in contact with one another: (A) a fluorinated organic compound, comprising at least one di-unsaturated cycle with 5 or 6 carbon atoms, having the following formula (I): wherein: H is a weakly acid hydrogen atom, each R i group (with i an integer from 1 to 7) is a sub stituent of the di-unsaturated cycle independently selected from hydrogen, fluorine or an aliphatic or aromatic, fluorinated or non-fluorinated hydrocarbyl group, having from 1 to 20 carbon atoms, optionally joined to a different R i hydrocarbyl group to form a further cycle, on the condition that at least two of the groups R 1 , R 2 , R 3 , R 4 or R 5 are independently selected from the group consisting of: fluorine; a fluorinated alkyl group having the formula —CF (R 9 R 10 ) wherein each R 9 or R 10 group can have any of the above meanings of the R i groups and at least one of them is fluorine, an alkyl fluorinated at least in position 1, a fluorinated aryl Ar F as defined below, or a fluorinated vinyl group V F as defined below; a fluorinated aryl group Ar F substituted on the aromatic ring with at least two of fluorine, a —CF(R 9 R 10 ) group as defined above or a different Ar F group; and a fluorinated vinyl group V F substituted on at least two positions of the double bond with at least one of a fluorine, a —CF(R 9 R 10 ) group or an Ar F group as defined above; and “m” can have the values of 0 or 1; (B) an organometallic compound sufficiently basic to react with the acid hydrogen of the above compound having formula (I) in an acid/base reaction; (C) a polar aprotic organic compound, not containing metallic atoms, having a dielectric constant, in the pure state, equal to or greater than 2, and a weak coordinating capacity corresponding to a donicity DN not greater than 15 kcal/moles.