METHOD OF PREPARING GROUP 14 BRIDGED BISCYCLOPENTADIENYL LIGANDS

摘要

A process for producing a propylene impact copolymer comprising component A and component B, comprising the steps of: (a) forming Component A in one polymerization stage; and (b) forming Component B in another polymerization stage in the presence of component A, the component A comprising a homopolymer or copolymer containing 10% by weight or less ethylene comonomer, butene, hexene or octene, and component B a propylene wherein the copolymer contains 20 to 70 wt% ethylene comonomer, butene, hexene and / or octene, and 80% to 30% by weight of propylene comprising, forming at least one components A and / or B in a polymerization process using a metallocene selected from the group consisting of: racemic dimethylsiladiyl (2-iPr, 4- phenylindenyl) 2circonio racemic, racemic dimethylsiladiyl (2-iPr, 4- [ 1-naphthyl] indenyl) 2circonio racemic, racemic dimethylsiladiyl (2-iPr, 4- [3, 5- dimethylphenyl] indenyl) 2circonio racemic, racemic dimethylsiladiyl (2-iPr-4- [2-methylphenyl] indenyl) 2circonio dichloride racemic diphenylsiladiyl (2-methyl-4- [1- naphthyl] indenyl) 2circonio racemate.