Patent ID: 6566294
Filing Date: 2003-05-20
Classification: C08F

Abstract:
A catalyst system for the polymerization of olefins comprising:(a) a solid magnesium supported titanium catalyst component; (b) an organoaluminum co-catalyst; and (c) a mixture of at least three electron donors; wherein the electron donors are selected from the group consisting of tetraethoxysilane, methylcyclohexyldimethoxysilane, propyltrimethoxysilane, propyltriethoxysilane, dimethyldimethoxysilane, methyltrimethoxysilane, dicyclopentyldimethoxysilane and mixtures thereof; and wherein high crystallinity donors are selected from the group consisting of dicyclopentyldimethoxysilane and methylcyclohexyldimethoxysilane are present from less than or equal to 10 mole % relative to the total amount of donor; and mid-crystallinity donors are selected from the group consisting of propyltrimethoxysilane, propyltriethoxysilane, tetraethoxysilane and methyltrimethoxysilane are present from 18 to 80 mole % relative to the total amount of donor.