STUDIES OF A SUPPORTED TITANIUM CATALYST SYSTEM USING MAGNESIUM DICHLORIDE-ALCOHOL ADDUCT

Magnesium dichloride reacts with aliphatic alcohols [ROH; R = n-C2H5, n-C3H7, i-C3H7, n-C4H9, i-C4H9, t-C4H9, n-C5H11, n-C6H13, C6H12(C2H5)] to form well-defined solid adducts. Compositional analysis of adducts indicates that the stoichiometric ratio of magnesium dichloride to al cohol depends on length of alkyl group and nature of isomeric alcohol. Magnesium dichloride-2-ethyl-1-hexanol adduct was treated with diphen yldichlorosilane in the presence of dibutylphthalate to obtain active magnesium dichloride support. The titanation process of active magnesi um dichloride gives supported magnesium-titanium catalyst (Mg-Ti). The catalyst was characterized by compositional analysis and specific sur face area measurements. Performance of the catalyst for polymerization of propene was evaluated with triethylaluminum (TEAL) and phenyltriet hoxysilane (PES) as cocatalyst. The yield and isotacticity of the poly mer is governed by polymerization parameters such as Si/Al ratio and p olymerization time.