| abstract |
A mixed metal-containing precursor is disclosed whereby the precursor includes: a) a mixed metal component represented by the following formula: n (M1M2) x (T1T2) y n where M1 and M2 may be the same or different and are selected from one or more metals having a +2 oxidation state, T1 and T2 may be the same or different and are selected from one or more metals having oxidation states selected from the groups consisting of +3, +4, and +5, the molar ratio of x/y is from about 2.5 to about 3.75, with the proviso that if M1 and M2 are both Mg then T1 and T2 cannot both be chosen from Zr and Ti +4 ; and b) at least one moiety complexed with component a) selected from alkoxide groups, phenoxide groups, halides, hydroxy groups, carboxyl groups, amide groups, and mixtures thereof. A polymerization procatalyst prepared from the mixed metal containing precursor, methods of making the precursor and procatalyst, as well as polymerization methods using the procatalyst also are disclosed. |