CATALYST SYSTEM FOR PRODUCING POLYPROPYLENE COPOLYMERS Russian patent published in 2011 - IPC C08F4/64 C08F4/651 C08F4/646 C08F4/634 C08F210/06 

FIELD: chemistry.

SUBSTANCE: described is a catalyst system for producing propylene copolymers, in which the weight ratio of the comonomer to the sum of monomers present in said polypropylene copolymer (comonomer/(comonomer + propylene)) is equal to at least 2.0 wt %, containing (a) procatalyst composition containing (i) a group 4-6 transition metal compound (IUPAC, Nomenclature of inorganic chemistry, 1989), (ii) MgCl₂ and (iii) an intrinsic donor in which said intrinsic donor contains diethyl phthalate, and (b) an extrinsic donor which is diisopropyl diethoxy silane (DIPDES), and (c) an organometallic cocatalyst. The invention describes a method of producing the described catalyst system in which a procatalyst is obtained at the first step and an extrinsic donor and a cocatalyst are added at the second step. The invention also describes propylene copolymers obtained in the presence of the described catalyst system.

EFFECT: high-strength propylene copolymers are obtained.

21 cl, 9 tbl, 25 dwg, 4 ex