| abstract |
1. A catalytic composition containing the contact product of a hybrid metallocene compound with an activator, wherein the hybrid metallocene compound has the formula:! ! where M represents Zr, Hf or Ti; ! X1 and X2 independently represent a halide or a substituted or unsubstituted aliphatic, aromatic or cyclic group, or a combination thereof; ! X3 represents a substituted or unsubstituted cyclopentadienyl, indenyl or fluorenyl, wherein each of the substituents of the X3 group independently represents a hydrogen atom or a substituted or unsubstituted aliphatic, aromatic or cyclic group, or a combination thereof; ! X4 represents! -O-RA, -NH-RA, -PH-RA, -S-RA, or -CRB = NRC, where! RA represents an aryl group substituted by an alkenyl substituent, each of the RA group substituents other than the alkenyl substituent independently represents a hydrogen atom or a substituted or unsubstituted alkyl, alkenyl or alkoxy group; and! RB and RC independently represent a hydrogen atom or a substituted or unsubstituted aliphatic, aromatic or cyclic group, or a combination thereof. ! 2. The catalyst composition according to claim 1, characterized in that X1 and X2 independently represent a methyl group, a phenyl group, a benzyl group or a halide. ! 3. The catalyst composition according to claim 1, characterized in that each of the substituents X3 independently represents a hydrogen atom, a methyl group, an ethyl group, a propyl group, an n-butyl group, a tert-butyl group or a hexyl group. ! 4. The catalyst composition according to claim 1, characterized in that the alkenyl substituent R is ethenyl, propene |