Catalyst composition for the polymerization of olefins
OwnerThomas Henry Petersoninventor
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Abstract
A catalyst composition for the polymerization of olefins is provided. The catalyst composition comprises a monocycloalkadienyl/metal/ligand catalyst precursor, wherein at least one ligand is capable of multihapto attachment to the metal atom through a carbon or hydrogen atom, and a cocatalyst capable of irreversibly abstracting a ligand from the catalyst precursor.
Claims18
A catalyst composition for the polymerization of olefins comprising:
- a) a catalyst precursor of the formula LMn+(X)y(R)(n-y-1), wherein L is a cycloalkadienyl ligand except for cyclopentadienyl and pentamethylcyclopentadienyl;
- M is an element selected from Groups 3 to 10 and the Lanthanides;
- each X is an anion;
- each R is a hydride or a group containing at least two carbons capable of attachment to M in a multihapto manner through at least one hydrogen or carbon atom;
- n is the valence of M;
- and y is an integer from 0 to 5.
- b) a cocatalyst capable of irreversibly abstracting an X or an R from the catalyst precursor such that at least one metal-carbon or metal-hydrogen bond is retained in the resulting activated catalyst.
A process for preparing a cycloalkadienyl/metal catalyst precursor, which comprises reacting a homoleptic metal alkyl complex with an alkaline or alkaline earth metal salt of a cycloalkadiene.
A process for preparing a cycloalkadienyl/metal catalyst precursor, which comprises reacting a metal alkyl-borate salt with an alkaline metal or alkaline earth metal salt of a cycloalkadiene.
A process for preparing a cycloalkadienyl/metal catalyst precursor, which comprises reacting a metal alkyl-borate salt with a cycloalkadiene.
A process for the polymerization of olefins, which comprises contacting olefins under polymerization conditions with a catalyst composition comprising:
- a) a catalyst precursor of the formula LMn+(X)y(R)(n-y-1), wherein L is a cycloalkadienyl ligand except for cyclopentadienyl and pentamethylcyclopentadienyl;
- M is an element selected from Groups 3 to 10 and the Lanthanides;
- each X is an anion;
- each R is a hydride or a group containing at least two carbons capable of attachment to M in a multihapto manner through at least one hydrogen or carbon atom;
- n is the valence of M;
- and y is an integer from 0 to 5;
- b) a cocatalyst capable of irreversibly abstracting an X or an R from the catalyst precursor such that at least one metal-carbon or metal-hydrogen bond is retained in the resulting activated catalyst.
Dependencies are inferred from the claim text.