Chromatography of polyolefin polymers
AssigneeDow Global Technologies LLC
InventorsFreddy A. Van Damme, John W. Lyons, William L. Winniford, Alexander Willem deGroot, Matthew D. Miller
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Abstract
A method and apparatus for chromatography of a polyolefin polymer by flowing a solution of the polyolefin polymer through liquid flowing through a graphitic carbon liquid chromatography stationary phase. The method can be used to determine the monomer to comonomer ratio of a polyolefin copolymer such as a copolymer of ethylene and 1-octene or a copolymer of propylene and ethylene.
Claims17
A method for chromatography of a polyolefin polymer, comprising the following step:
- introducing a solution of the polyolefin polymer into a liquid flowing through a liquid chromatography stationary phase, the liquid chromatography stationary phase comprising graphitic carbon, and wherein the polyolefin polymer emerging from the liquid chromatography stationary phase has a retention factor greater than zero.
An improved liquid chromatography method comprising the step of introducing a solution of a polyolefin polymer into a liquid flowing through a liquid chromatography stationary phase, the polyolefin polymer emerging from the liquid chromatography stationary phase with a retention factor greater than zero, the improvement comprising the liquid chromatography stationary phase comprising graphitic carbon.
An apparatus for determining the monomer to comonomer ratio of a copolymer, wherein the apparatus comprises a high temperature liquid chromatography unit comprising a graphitic carbon liquid chromatography column, a pump, a polymer solution, and
- a means for an additional fractionation by size exclusion chromatography or asymmetric flow field flow fractionation, added after the fractionation by the graphitic column.
Dependencies are inferred from the claim text.