Polymerization processes
AssigneeExxonMobil Chemical Patents Inc.
InventorsDonna J. Crowther, Timothy M. Boller, Richard B. Pannell, Jeanette M. Diop, Wen Li
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Abstract
Polymerization processes to produce polyolefin polymers, for example, polyethylene polymers, from catalyst systems comprising one or more olefin polymerization catalysts and at least one activator are provided. The polyolefin polymers may have a Broad Orthogonal Composition Distribution (BOCD).
Claims22
A polymerization process to produce a polyethylene polymer, the process comprising contacting a catalyst system comprising a product of a combination of one or more metallocene catalysts, at least one activator, and at least one support, with ethylene and one or more C3-C10 alpha-olefin comonomers under polymerizable conditions including a temperature range of from 10° C. to 75° C., to produce the polyethylene polymer;
- wherein the polyethylene polymer has a broad orthogonal composition distribution (BOCD) and furthermore has a density of from 0.890 g/cm3 to 0.950 g/cm3, and
- further wherein the one or more metallocene catalysts comprises:
- (A) a compound represented by Formula (I):
- TyCpmM6GnX5q (I),
- wherein each Cp is, independently, a cyclopentadienyl group which may be substituted or unsubstituted, M6 is a Group 4 transition metal, G is a heteroatom group represented by the Formula JR*z where J is N, and R* is methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, cyclooctyl, cyclododecyl, decyl, undecyl, dodecyl, adamantyl or an isomer thereof and z is 1 or 2, T is a bridging group, and y is 1, X5 is a leaving group, and m=1, n=1, q=0, 1, 2 or 3, and the sum of m+n+q is equal to the oxidation state of the transition metal;
- and/or
- (B) one or more of the following compounds:
- dimethylsilyl (tetramethylcyclopentadienyl)(cyclododecylamido)titanium dimethyl;
- dimethylsilyl (tetramethylcyclopentadienyl)(cyclododecylamido)titanium dichloride;
- dimethylsilyl (tetramethylcyclopentadienyl)(t-butylamido)titanium dimethyl;
- dimethylsilyl (tetramethylcyclopentadienyl)(t-butylamido)titanium dichloride;
- μ-(CH3)2Si(cyclopentadienyl)(1-adamantylamido)M7(R15)2;
- μ-(CH3)2Si(3-tertbutylcyclopentadienyl)(1-adamantylamido)M7(R15)2;
- μ-(CH3)2C(tetramethylcyclopentadienyl)(1-adamantylamido)M7(R15)2;
- μ-(CH3)2Si(tetramethylcyclopentadienyl)(1-adamantylamido)M7(R15)2;
- μ-(CH3)2C(tetramethylcyclopentadienyl)(1-tertbutylamido)M7(R15)2;
- μ-(CH3)2Si(tetramethylcyclopentadienyl)(1-tertbutylamido)M7(R15)2;
- μ-(CH3)2Si(fluorenyl)(1-tertbutylamido)M7(R15)2;
- μ-(CH3)2Si(tetramethylcyclopentadienyl)(1-cyclododecylamido)M7(R15)2;
- or
- μ-(C6H5)2C(tetramethylcyclopentadienyl)(1-cyclododecylamido)M7(R15)2,
- where M7 is selected from a group consisting of Ti, Zr, and Hf and R15 is selected from halogen or C1-C5 alkyl.
Dependencies are inferred from the claim text.