Patent ID: 8470941

Claim:
A catalyst for polymerizing propylene, comprising a titanium compound having at least one Ti-halogen bond, a first electron donor compound A supported on a MgCl 2 .nROH adduct, wherein n is 1.5-4, and R is C 1 -C 4 alkyl, and a second electron donor compound B supported on said MgCl 2 .nROH adduct; wherein the electron donor compound A is a sulphonyl compound of formula (I): wherein, X is selected from the group consisting of unsubstituted Group 14 elements, unsubstituted Group 15 elements, unsubstituted Group 16 elements, disubstituted Group 14 elements with a substituent which can be monocycle, polycycle, heteroatom-containing cyclic group or various aliphatic chainlike groups, and mono substituted Group 15 elements with a substituent which can be monocycle, polycycle, heteroatom-containing cyclic group or various aliphatic chainlike groups, and wherein X is C(R 3 )(R 4 ), Si(R 3 )(R 4 ), Sn(R 3 )(R 4 ), Pb(R 3 )(R 4 ), N(R 5 ), P(R 6 ), As(R 6 ). O, S, Se or Te, wherein R 3 and R 4 are identical or different, and R 3 R 4 R 5 and R 6 may each be hydrogen, halogen, unsubstituted or substituted alkyl, cycloalkyl, aryl, aralkyl, alkylaryl, alkyl alkenyl, alkenyl alkyl, alkyl alkynyl, heteroatom-containing ring or acyl, respectively, or R 3 , R 4 and C constitute cycloalkyl or cycloalkenyl in the sulphonyl compound of formula (I); R 1 and R 2 can be the same or different, and can each be hydrogen, halogen, unsubstituted or substituted alkyl, cycloalkyl, aryl, aralkyl, alkylaryl or heteroatom-containing ring; and wherein the electron donor compound B is an ester or an ether compound; and wherein the molar ratio of electron donor compound A to electron donor compound B is between 0.1:1 and 5:1; and wherein the molar ratio of the total amounts of the two kinds of electron donors to MgCl 2 .nROH is between 0.01:1 and 1:1; and wherein the molar ratio of the titanium compound containing Ti-halogen bond to MgCl 2 .nROH is between 1:1 and 200:1.