Dual catalyst on a single support
AssigneeNOVA Chemicals (International) S.A.
InventorsPeter Phung Minh Hoang, Cliff Robert Baar, Peter Zoricak, Gail Baxter
Life of this patent
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Abstract
Bimodal polyolefins having a reverse or partial reversed comonomer incorporation may be prepared in the presence of a dual catalyst on the same support wherein each catalyst has a different response to temperature, ethylene partial pressures, partial pressure of non-polymerizable hydrocarbons present in the reaction mixture and hydrogen partial pressure.
Claims27
A dual catalyst system suitable for producing a bimodal resin having at least one higher molecular weight fraction having a greater comonomer incorporation than that of a lower molecular weight fraction wherein:
- (i) the first component of which comprises a compound of the formula:
- wherein M is a group IV transition metal;
- R1 and R6 are independently selected from the group consisting of a hydrogen atom, alkyl radicals having up to 15 carbon atoms, aryl radicals having up to 25 carbon atoms, alkoxy radicals having up to 15 carbon atoms, and amido radicals which are unsubstituted or substituted by up to two alkyl radicals containing up to 15 carbon atoms, R2 and R7 are independently selected from the group consisting of alkyl radicals having up to 15 carbon atoms, aryl radicals having up to 25 carbon atoms and silyl radicals of the formula Si(R11)3 wherein each R11 is independently selected from the group consisting of alkyl radicals having up to 15, carbon atoms, and aryl radicals having up to 25 carbon atoms;
- R3, R4, R5, R8, R9 and R10 are independently selected from the group consisting of a hydrogen atom, a heteroatom containing group having up to 20 carbon atoms, and a hydrocarbon group containing up to 25 carbon atoms, provided that none of these groups has a Hammett σρ value greater than 0.20;
- X and X′ are selected from the group consisting of a halogen atom, alkyl radicals having up to 15 carbon atoms, aryl radicals having up to 25 carbon atoms, alkoxy radicals having up to 15 carbon atoms, amido radicals which are unsubstituted or substituted by up to two alkyl radicals containing up to 15 carbon atoms, and phenoxy radicals having up to 18 carbon atoms;
- (ii) the second component of which comprises a compound of the formula:
- wherein M is a group 4 metal;
- Pl is a phosphinimine ligand;
- L is a monoanionic ligand selected from the group consisting of a cyclopentadienyl-type ligand or a bulky heteroatom ligand;
- Y is an activatable ligand;
- m is 1 or 2;
- n is 0 or 1;
- and p is an integer and the sum of m+n+p equals the valence state of M.
Dependencies are inferred from the claim text.