Phenolate constrained geometry polymerization catalyst and method for preparing
AssigneeNorthwestern University
InventorsTobin J. Marks, You-Xian Chen
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Abstract
The subject invention involves a method of preparing and the constrained geometry catalyst thereby prepared of the general formula Ar'R4(O)Ar"R'.sub.4 M(CH.sub.2 Ph).sub.2 where Ar' is a phenyl or naphthyl group; Ar" is a cyclopentadienyl or indenyl group, R and R' are H or alkyl substituents (C.ltoreq.10) and M is Ti, Zr or Hf. The synthetic method involves a simple alkane elimination approach which permits a "one-pot" procedure. The catalyst, when combined with a cocatalyst such as Pb.sub.3 C.sup.+ B(Ar.sub.3.sup.F).sub.4 BAr.sub.3.sup.F or methyl alumoxane where Ar.sup.F is a fluoroaryl group, is an effective catalyst for the polymerization of .alpha.-olefins such as ethylene, propylene and styrene.
Claims8
A catalytic complex of the formula:
- (Ar'R.sub.4)(O)(Ar"R'.sub.4)M(CH.sub.2 Ph).sub.2
- where
- Ar' is a phenyl or naphthyl group;
- Ar" is a cyclopentadienyl or indenyl group;
- R, R' is each H, alkyl (C.ltoreq.10) or a mixture thereof;
- and
- M is Ti, Zr, or Hf.
A method of preparing a catalyst including the step of adding 2-tetra methylcyclopentadienyl-4-methyl phenol to Ti(CH.sub.2 Ph).sub.4.
A method of polymerizing an olefin comprising the step of adding a catalyst to said olefin, said catalyst including the combination of (TCP)M(CH.sub.2 Ph).sub.2, where TCP=2-tetramethylcyclopentadienyl-4-methyl phenolate;
- and Ph.sub.3 C.sup.+ B(C.sub.6 F.sub.5).sub.4.sup.-.
A catalytic complex of the formula:
- (TCP)M(CH.sub.2 Ph.sub.2) where
- TCP is 2-tetramethylcyclopentadienyl-4-methyl phenolate;
- and
- M is Ti, Zr, or Hf.
Dependencies are inferred from the claim text.