##STR00001##

Embodiments of the present application are directed to procatalysts, and catalyst systems including procatalysts, including a metal-ligand complex having the structure of formula (I):

The present invention relates to a method for preparing a catalyst, and in particular provides a method for preparing a catalyst suitable for the polymerisation of ethylene and/or propylene, said catalyst comprising a compound of yttrium, neodymium or scandium supported on a silica support, and wherein the method comprises: a) Treating a silica support by heating at a temperature of at least 550° C., b) Contacting the treated silica support with a complex of the following formula: D.sub.mMX.sup.1X.sup.2R wherein M is selected from Y, Sc and Nd, R is a hydrocarbyl group, X.sup.1 and X.sup.2 are anionic groups, D is a neutral donor group, and m is 0 or greater.

The present invention relates to a process for the preparation of a polyethylene wax, the process comprising the steps of providing a catalyst solution, wherein the catalyst solution comprises at least one activating compound, an alkylaluminoxane and a me-tallocene complex, wherein the molar ratio of the activating compound to aluminum comprised in the alkylaluminoxane is from 0.0005 to 0.20; and polymerizing ethylene, by contacting the ethylene and the catalyst solution.

The present invention provides a polyolefin polymer having a bimodal composition with a reduced higher molecular weight component prepared using a self-supported phosphinimine single site catalyst. The catalyst is prepared by precipitating an emulsion of the activated catalyst from a perfluoroalkane continuous phase resulting in spherical catalyst particles having a diameter typically from 5 to 200 μm.

Embodiments of the present application are directed to procatalysts, and catalyst systems including procatalysts, including a metal-ligand complex having the structure of formula (Ia):

##STR00001##

Disclosed is a method for preparing a titanium solid catalyst supported on magnesium dichloride that may be used to prepare ultra-high molecular weight polyethylene having a high apparent density. Performing a polymerization reaction using a solid catalyst containing titanium tetrachloride and a phthalate compound may allow ultra-high molecular weight polyethylene having uniform particle size and high apparent density to be prepared.

The present disclosure provides methods for preparing a catalyst system comprising contacting in an aliphatic solvent at least one support material, at least one hydrocarbyl aluminum compound and at least one non-hydrolytic active oxygen-containing compound to form a supported alumoxane (catalyst system precursor) and contacting the supported alumoxane with at least one catalyst compound having a Group 3 through Group 12 metal atom or lanthanide metal atom. The supported alumoxane may be heated prior to contact with the catalyst compound.

The present invention relates to novel chemical solutions suitable for forming polymer brushes on a surface of a solid part. The present invention further relates to methods of forming polymer brushes on the surface of a solid part using the novel chemical solutions as well as solid parts having polymer brushes coated onto the surface and uses of such solid parts.

The present invention relates to novel chemical solutions suitable for forming polymer brushes on a surface of a solid part. The present invention further relates to methods of forming polymer brushes on the surface of a solid part using the novel chemical solutions as well as solid parts having polymer brushes coated onto the surface and uses of such solid parts.

The present invention relates to a process for the preparation of a polyethylene wax, the process comprising the steps of providing a catalyst solution, wherein the catalyst solution comprises at least one activating compound, an alkylaluminoxane and a me-tallocene complex, wherein the molar ratio of the activating compound to aluminum comprised in the alkylaluminoxane is from 0.0005 to 0.20; and polymerizing ethylene, by contacting the ethylene and the catalyst solution.