Polymerisation catalysts
AssigneeBP Chemicals Limited
InventorRichard Henry Weatherhead
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Abstract
A catalyst system suitable for preparing substantially terminally unsaturated atactic polymers or copolymers of α-olefins having a number average molecular weight in the range 300-500,000 comprises (A) a metallocene complex and (B) a cocatalyst comprising (i) a Group III Metal alkyl compound and (ii) a triaryl boron compound. Preferred metallocenes are those having alkyl ligands on the metal atom. The preferred Group III metal alkyl compound is triisobutyl aluminum and the preferred triaryl boron compounds is tris(pentafluorophenyl)boron.
Claims14
A catalyst system suitable for use in the preparation of substantially terminally unsaturated atactic polymers or copolymers of α-olefins having a number average molecular weight in the range 300-500,000 said catalyst system comprising
- (A) a metallocene of formula:
- [RmCpH(5−m)][RnCpH(5−n)]M(Z)Y
- wherein
- CpH is a cyclopentadienyl ligand,
- each R represents an alkyl or an aryl substituent on the CpH ligand or two R's may be joined together to form a ring,
- M is a metal selected from hafnium, zirconium and titanium, each of m and n is the same or different and has a value of 0 to 5, and
- Z and Y are hydrocarbyl, and
- (B) a cocatalyst comprising (i) a trialkylaluminium compound or a trialkylboron compound and (ii) a triarylboron compound.
Dependencies are inferred from the claim text.