Ethylene styrene copolymer with isolated styrene

The present invention relates to copolymers of one or more C alpha olefins with one or more C vinyl aromatic monomers, in which the vinyl aromatic monomer is incorporated into the polymer in a manner such that the distribution of vinyl aromatic monomer does not follow a Bernoullian statistical distribution and not less than 90% of the vinyl aromatic monomer is in the form of triads of the structure of C alpha olefin-vinyl aromatic monomer -C alpha olefin as determined by C NMR. An ethylene styrene copolymer having isolated styrene monomer units separated by 5 or 6 methylene groups as determined by C-NMR may be polymerized in the presence of an activator and a transition metal catalyst containing a phosphinimine ligand.