Patent ID: 6982238

Claim:
A supported chromium catalyst system comprising a chromium catalyst bound via at least one heteroatom to a functionalised support, said heteroatom being connected to said support via an organic group wherein said chromium catalyst is derived from (i) a compound of formula (I) CrA x R y (I) wherein each A independently represents an η-ligand; each R independently represents halogen, alkenyl, siloxy, alkyl, alkoxy, amido or cyclopentadienyl; x is an integer of 1 or 2; and y is an integer of 1 to 2 wherein x+y=3; (ii) a compound of formula (II) CrD 4 (II) wherein each D independently represents alkyl, siloxy, alkoxy, oxo, halo or aryl, provided that if D is oxo then only two oxo groups are present; or (iii) a compound of formula Cr(η-ligand) 2 or CrD(η-ligand) wherein D represents alkyl, siloxy, alkoxy, oxo, halo or aryl.