Catalyst composition for the (co) polymerization of propylene

Abstract

The present invention relates to a process for the production of propylene polymers in the presence of a blend of a first Ziegler-Natta catalyst, which comprises a titanium compound having at least one titanium-halogen bond and a diether compound as internal electron donor, and a second Ziegler-Natta catalyst, which comprises a titanium compound having at least one titanium-halogen bond and a succinate compound as internal electron donor.

1 - 11 . (canceled) 
     
     
         12 . A process for the production of propylene polymers comprising:
 polymerizing propylene and one or more optional comonomers in one or more polymerization reactors in presence of a Ziegler-Natta catalyst comprising a titanium compound having at least one titanium-halogen bond, and a diether compound as internal electron donor, both supported on a magnesium halide in active form, a Ziegler-Natta catalyst comprising a titanium compound having at least one titanium-halogen bond, and a succinate compound as internal electron donor, both supported on a magnesium halide in active form, an organoaluminium compound and an optional external donor, wherein the weight ratio of diether catalyst to succinate catalyst is in the range from 0.01 to 100.   
     
     
         13 . The process of  claim 12 , wherein the diether catalyst and the succinate catalyst are injected together into the polymerization reactor. 
     
     
         14 . The process of  claim 12 , wherein the diether catalyst and the succinate catalyst are injected separately into the polymerization reactor. 
     
     
         15 . The process of  claim 14 , wherein the diether catalyst and the succinate catalyst are injected at different places into the polymerization reactor. 
     
     
         16 . The process of  claim 12 , wherein the propylene polymer is a bimodal propylene polymer. 
     
     
         17 . The process of  claim 12 , wherein the propylene polymer is a propylene homopolymer. 
     
     
         18 . The process of  claim 12 , wherein the propylene polymer is a propylene copolymer. 
     
     
         19 . The process of  claim 18 , wherein the propylene copolymer has a bimodal ethylene distribution. 
     
     
         20 . The process of  claim 18 , wherein the propylene polymer is a heterophasic propylene copolymer. 
     
     
         21 . The process of  claim 20 , wherein the heterophasic propylene copolymer is produced sequentially in one or more loop reactors and s gas-phase reactor. 
     
     
         22 . A propylene polymer formed by the process of  claim 12 .