Patent ID: 7005399

Claim:
A propylene polymerization catalyst, consisting of: (A) a solid catalyst component prepared by contacting (a) a dialkoxy magnesium, (b) a tetra-valent titanium halide, and (c) a plithalic acid diester in (d) an aromatic hydrocarbon having a boiling point in the range of 50 to 150° C.; (B) an organoaluminum compound of formula (1): R 1 p AlQ 3−p (1) wherein R 1 is an alkyl group having 1 to 4 carbon atoms, Q is a hydrogen atom or a halogen atom, and p is a real number that satisfies the inequality 0<p≦3; and (C) one or more halogen-containing organosilicon compounds selected from the group consisting of triethoxychlorosilane, methyldimethoxychlorosilane, methyldiethoxychlorosilane, n-butyldiethoxychlorosilane, t-butyldimethoxychlorosilane, t-butyldiethoxychlorosilane, cyclohexyldimethoxychlorosilane, cyclopentyldimethoxychlorosilane, ClCH 2 Si(OC 2 H 5 ) 3 , BrCH 2 Si(OC 2 H 5 ) 3 , (ClCH 2 ) 2 Si(OCH 3 ) 2 , (ClCH 2 ) 2 Si(OC 2 H 5 ) 2 , (BrC 2 H 4 ) 2 Si(OCH 3 ) 2 and (BrC 2 H 4 ) 2 Si(OC 2 H 5 ) 2 .