Metallocene catalyst

Patent Granted These catalysts are metallocenes together with a cocatalyst, typically MAO, [−O–Al–CH(CH3-)n. The idealized metallocene catalysts have the composition Cp2MCl2 (M = Ti, Zr, Hf) such as titanocene dichloride. Typically, the organic ligands are derivatives of cyclopentadienyl. In some complexes, the two cyclopentadiene (Cp) rings are linked with bridges, like −CH2−CH2− or >SiPh2.,[5][6][7] Depending of the type of their cyclopentadienyl ligands, for example by using an Ansa-bridge, metallocene catalysts can produce either isotactic or syndiotactic polymers of propylene and other 1-alkenes.,