Patent ID: 7473741

Claim:
A process for the selective hydrogenation of double olefinic bonds present in an unsaturated (co)polymer, which comprises: (a) preparation of a hydrocarbon solution of said unsaturated (co)polymer to be hydrogenated, optionally containing a modifier (C); (b) in situ formation, under a hydrogen atmosphere, of a catalytic solution in said hydrocarbon solution by addition into said hydrocarbon solution of: (b1) at least one bis-(cyclopentadienyl) titanium derivative having the general formula (I) (C 5 H 5 ) 2 Ti(R)(R 1 ), wherein R and R 1, the same or different, are halogens; the above compound (I) being dispersed in one or more non-solvent diluents; (b2) at least one organo-derivative having general formula (II) M(R 2 )(R 3 ), wherein M is selected from zinc and magnesium, and R 2 and R 3, the same or different, are selected from C 1 -C 16 alkyls; and (b3) at least one modifier (C); the above selective hydrogenation being carried out in a hydrogen atmosphere, wherein said modifier (C) is selected from nitrogenated organic compounds, oxygenated organic compounds, and aromatic compounds.