Patent ID: 6069213
Filing Date: 2000-05-30
Classification: C08F,Y10S

Abstract:
A composition comprising an unsupported metallocene catalyst and a supported metallocene catalyst wherein both the unsupported and supported metallocene catalyst satisfy at least one of the following structural formulae (II) or (III): ##STR7## wherein: M is a Hf or Zr metal;L is a substituted or unsubstituted, .pi.-bonded ligand coordinated to M;each Q is independently selected from the group consisting of --O--,--NR.sup.3 --, --CR.sup.3.sub.2 --and --S--;Y is C;Z is selected from the group consisting of --OR.sup.3, --NR.sup.3.sub.2, --CR.sup.3.sub.3, --SR.sup.3, --SiR.sup.3.sub.3, --PR.sup.3.sub.2, and --H, with the proviso that when Q is --NR.sup.3 -- then Z is selected from the group consisting of --OR.sup.3, --NR.sup.3.sub.2, --SR.sup.3, --SiR.sup.3.sub.3, --PR.sup.3.sub.2, and --H;n is 1 or 2;A is a univalent anionic group when n is 2 or A is a divalent anionic group when n is 1; andeach R.sup.3 is independently a group containing carbon, silicon, nitrogen, oxygen, and/or phosphorus and one or more R.sup.3 groups may be attached to the L substituent;T is a bridging group selected from the group consisting of alkylene groups containing from 1 to 10 carbon atoms optionally substituted with carbon or heteroatoms, arylene groups containing from 1 to 10 carbon atoms optionally substituted with carbon or heteroatoms, germanium, silicone and alkyl phosphine; andm is 1 to 7.