Polymerization catalysts, their production and use

A method for producing a catalyst system, said method comprising the steps of:

• (a) producing a set of components in-situ to form a product, said product comprising:
• (i) a first component comprising at least one transition metal of Group IV, V or VI and at least two cyclopentadienyl containing rings, said rings each having at least two substituents bonded to each of said rings in the same position;
• (ii) a second component comprising said transition metal and said cyclopentadienyl containing rings, said rings each having at least two substituents bonded to each of said rings in the same or different position than said substituents of said first component;
• said substituents of the said first and second components are the same or different, with the provision that when the substituents of said first and second components are the same, said substituents of said components are bonded to said rings in different positions;
• and
• (iii) a third component comprising said transition metal bonded to said cyclopentadienyl containing rings where one of said rings is substituted identically as said first component and another of said rings is substituted identically as said second component;
• wherein producing said set of components comprises the step of producing a first, second, and third component simultaneously wherein producing a component comprises:
• (i) providing a transition metal;
• (ii) providing at least two cyclopentadienyl containing rings;
• and
• (iii) combining the transtition metal and the rings;
• and
• (b) introducing a cocatalyst or an activator.