Process to produce polymers

A process for polymerizing olefins in the presence of a catalyst composition, comprising:

• contacting the catalyst composition with at least one olefin monomer under polymerization conditions to produce a polymer, wherein the catalyst composition comprises:
• (a) a first component comprising chromium on a support, wherein the support comprises phosphated alumina;
• and
• (b) a second component comprising:
• (1) the contact product of:
• i) a metal halide compound, wherein the metal halide compound is a metal dihalide compound or a metal hydroxyhalide compound of a Group IIA or Group IIB metal of the Mendeleev Periodic Table;
• ii) a transition metal compound, wherein the transition metal compound comprises a transition metal of Group IVB or Group VB of the Mendeleev Periodic Table, and wherein the transition metal compound comprises at least one hydrocarbyl oxide ligand, at least one hydrocarbyl amide ligand, at least one hydrocarbyl imide ligand, or at least one hydrocarbyl thiolate ligand;
• and
• iii) a precipitating agent, wherein the precipitating agent is an organometallic compound of a Group I, II, or III metal of the Mendeleev Periodic Table;
• a metal halide or a metal oxyhalide of a Group IIIA, IVA, IVB, VA, or VB metal of the Mendeleev Periodic Table;
• a hydrogen halide;
• or an organic acid halide RC(O)X, wherein R is an alkyl, an aryl, a cycloalkyl, or a combination thereof having from 1 to about 12 carbon atoms, and X is a halogen atom;
• or
• (2) a substituted or unsubstituted dicyclopentadienyl chromium compound deposited onto a calcined oxide carrier, wherein the carrier comprises silica, alumina, aluminophosphate, or any mixture or mixed oxide thereof.