Phosphinimide catalysts for olefin polymerization
AssigneeNOVA Chemicals (International) S.A.
InventorCheng Fan
Life of this patent
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Abstract
A phosphinimide catalyst system comprises: i) a phosphinimide pre-polymerization catalyst having a cyclopentadienyl ligand and a phosphinimide ligand which is substituted with a guanidinate type group; and ii) a catalyst activator. The catalyst system polymerizes ethylene with an alpha-olefin to give high molecular weight ethylene copolymer.
Claims24
A phosphinimide pre-polymerization catalyst having the following structure:
- wherein M is Ti, Zr or Hf;
- P is phosphorus;
- N is nitrogen;
- L is a cyclopentadienyl type ligand;
- each X is independently an activatable ligand;
- R1 is independently selected from a hydrogen atom, a hydrocarbyl group which is unsubstituted or substituted with one or more halogen atom, an alkoxy group, an aryl group, an aryloxy group, an amido group, a silyl group, and a germanyl group;
- G is a guanidinate type group having the following structure:
- where A1, A2, A3, and A4 are independently hydrogen, an acyclic or a cyclic hydrocarbyl group, or an acyclic or a cyclic heteroatom containing hydrocarbyl group, and where any of A1 to A4 may be part of a cyclic hydrocarbyl group or a cyclic heteroatom containing hydrocarbyl group;
- x is 0, 1, or 2;
- y is 3, 2, or 1;
- and x+y=3.
A polymerization catalyst system comprising:
- i) a phosphinimide pre-polymerization catalyst having the following structure:
- wherein M is Ti, Zr or Hf;
- P is phosphorus;
- N is nitrogen;
- L is a cyclopentadienyl type ligand;
- each X is independently an activatable ligand;
- R1 is independently selected from a hydrogen atom, a hydrocarbyl group which is unsubstituted or substituted with one or more halogen atom, an alkoxy group, an aryl group, an aryloxy group, an amido group, a silyl group, and a germanyl group;
- G is a guanidinate type group having the following structure:
- where A1, A2, A3, and A4 are independently hydrogen, an acyclic or a cyclic hydrocarbyl group, or an acyclic or a cyclic heteroatom containing hydrocarbyl group, and where any of A1 to A4 may be part of a cyclic hydrocarbyl group or a cyclic heteroatom containing hydrocarbyl group;
- x is 0, 1, or 2;
- y is 3, 2, or 1;
- and x+y=3;
- and
- ii) a catalyst activator.
A polymerization process comprising polymerizing ethylene optionally with one or more C3-12 alpha olefins in the presence of a polymerization catalyst system comprising:
- i) a phosphinimide pre-polymerization catalyst having the following structure:
- wherein M is Ti, Zr or Hf;
- P is phosphorus;
- N is nitrogen;
- L is a cyclopentadienyl type ligand;
- each X is independently an activatable ligand;
- R1 is independently selected from a hydrogen atom, a hydrocarbyl group which is unsubstituted or substituted with one or more halogen atom, an alkoxy group, an aryl group, an aryloxy group, an amido group, a silyl group, and a germanyl group;
- G is a guanidinate type group having the following structure:
- where A1, A2, A3, and A4 are independently hydrogen, an acyclic or a cyclic hydrocarbyl group, or an acyclic or a cyclic heteroatom containing hydrocarbyl group, and where any of A1 to A4 may be part of a cyclic hydrocarbyl group or a cyclic heteroatom containing hydrocarbyl group x is 0, 1, or 2;
- y is 3, 2, or 1;
- and x+y=3;
- and
- ii) a catalyst activator.
Dependencies are inferred from the claim text.