Patent ID: 7723449

Claim:
A catalyst for synthesizing a polypropylene with a wide molecular weight distribution, the catalyst comprising magnesium halide, titanium-containing compound and an organic phosphate electron donor compound at the following molar ratios per mole magnesium halide; the proportion of titanium-containing compound being in terms of metal Ti is 0.5-150 mol; the proportion of organic phosphate electron donor compound is 0.02-0.40 mol; said magnesium halide being at least one selected from a group consisting of magnesium dihalides, complexes of magnesium dihalide with water or alcohols, and derivatives of magnesium dihalides, wherein a halogen atom in the molecular formula of the magnesium dihalides is replaced by an alkyl group or a haloalkoxy group; said titanium-containing compound being a liquid titanic compound with the general formula of TiX n (OR) 4-n , wherein n is an integer from 1 to 4; each X represents a halogen; and each R represents a C 1 -C 4 alkyl group; the general formula of said organic phosphate electron donor compound being as follows: wherein R 1 , R 2 and R 3 are the same or different from each other and each of them independently represents a group selected from a group consisting of C 1 -C 20 linear or branched alkyl group, aryl group, alkoxyaryl group, and alkylaryl group.