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US 2019/0241683 A1Published application
Thermally tunable phosphinimine catalysts
AssigneeNOVA Chemicals (International) S.A.
InventorDarryl J. Morrison
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Abstract
A new phosphinimine polymerization catalyst exhibits restricted rotation about a carbon-phosphorous bond. The restricted rotation is demonstrated using variable temperature 1H NMR. Ethylene copolymers made using the catalysts have microstructures which are dependent on the temperature at which polymerization takes place.
Claims11
A phosphinimine polymerization catalyst having the following structure:
- wherein M is Ti, Zr or Hf;
- L is a cyclopentadienyl type ligand;
- each X is independently an activatable ligand;
- A1 is a H or a substituted or unsubstituted alkyl group;
- A2 and A5 are independently an acyclic or a cyclic hydrocarbyl group or an acyclic or a cyclic heteroatom containing hydrocarbyl group;
- A3 and A4 are independently a H, a halide, an acyclic or a cyclic hydrocarbyl group or an acyclic or a cyclic heteroatom containing hydrocarbyl group;
- and where any of A2 to A5 may be part of a cyclic hydrocarbyl group or a cyclic heteroatom containing hydrocarbyl group.
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A solution polymerization process comprising polymerizing ethylene with one or more C3-12 alpha olefins in a solvent in the presence of a catalyst system comprising:
- i) a phosphinimine polymerization catalyst having the following structure:
- wherein M is Ti, Zr or Hf;
- L is a cyclopentadienyl type ligand;
- each X is independently an activatable ligand;
- A1 is a H or an alkyl group;
- A2 and A5 are a hydrocarbyl group or heteroatom containing hydrocarbyl group;
- A3 and A4 are H, a hydrocarbyl group, or a heteroatom containing hydrocarbyl group;
- and where any of A2 to A5 may be part of a cyclic hydrocarbyl group or a cyclic heteroatom containing hydrocarbyl group;
- and
- ii) a catalyst activator selected from the group consisting of an ionic activator, an alkylaluminoxane or a mixture thereof.
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Dependencies are inferred from the claim text.