Patent ID: 7619048
Filing Date: 2009-11-17
Classification: C08F

Abstract:
1. A method for producing a propylene polymer using a catalyst system for propylene polymerization, wherein the catalyst system comprises: a Ziegler type catalyst comprising magnesium, titanium, halogen and an internal electron donor, as a main catalyst component; and an alkyl aluminum compound as a cocatalyst; and an alkoxysilane compound represented as a general formula of [R 2 R 3 R 4 SiX] m SiR 5 n (OR 6 ) 4-m-n , wherein each of R 2 , R 3 , R 4 and R 5 is an alkyl having 1-6 carbon atoms, respectively; X represents —(CH 2 ) p —, wherein p is an integer of 1˜4, or —O—; R 6 is an alkyl having 1˜3 carbon atoms; m is an integer of 1 or 2; n is an integer of 0 or 1; and m+n is an integer of 1 or 2 as an external electron donor.