Polymerization catalyst systems and their use

A process for polymerizing olefin(s) in the presence of a catalyst system comprising a bulky ligand hafnium transition metal metallocene-type catalyst compound having at least one bulky ligand substituted with a substituent having 3 or more non-hydrogen atom, and an activator.

A continuous gas phase process for polymerizing olefin(s) in a fluidized bed gas phase reactor in the presence of a catalyst system to produce a polymer product, the catalyst system comprising a bulky ligand hafnium transition metal metallocene-type catalyst compound having at least one bulky ligand substituted with a substituent having 3 or more carbon atoms, and the polymer product comprising less than 2 ppm hafnium.

A continuous slurry phase process for polymerizing olefin(s) in the presence of a catalyst system to produce a polymer product in a liquid polymerization medium, the catalyst system comprising a bulky ligand hafnium transition metal metallocene-type catalyst compound having at least one bulky ligand substituted with a substituent having 3 or more carbon atoms, and the polymer product comprising less than 2 ppm hafnium.

A polymer produced with a hafnocene catalyst system, the polymer comprising ethylene and having a hafnium content in the range of 0.1 to 1 ppm.

A polyethylene polymer produced with a hafnocene catalyst system, the polymer having a density in the range of 0.865 to 0.97 g/cc, a Mw/Mn in the range of between 2 to 3 and a hafnium content of less than 2 ppm.

An ethylene based polymer produced by a catalyst system comprising a bulky ligand hafnium transition metal metallocene-type catalyst compound, wherein at least one bulky ligand is substituted with a substituent having 3 to 5 carbon atoms, the polymer having a settled bulk density in the range from 15 to 30 lb/ft3 (240 to 481 kg/m3), a Mw/Mn in the range of from 2 to 3, a density in the range of from 0.900 g/cc to greater than 0.97 g/cc and a hafnium content in the range of from 0.1 to 1 ppm.