IP Library › Granted Patent US 8,318,896
Granted Patent B2
US 8,318,896 · App. 12/643,111 · Granted Nov 27, 2012

Chromatography of polyolefin polymers

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Quick Facts
Patent No.
US 8,318,896
App. No.
12/643,111
Granted
Nov 27, 2012
Kind
B2
Abstract

A method for multi-dimensional chromatography of a polyolefin polymer, comprising introducing a solution of the polyolefin polymer into a liquid flowing through a first liquid chromatography stationary phase or a field flow fractionation device and subsequently flowing the solution through a second liquid chromatography stationary phase, the second liquid chromatography stationary phase comprising graphitic carbon, the polyolefin polymer emerging from the liquid chromatography stationary phase with a retention factor greater than zero.

Claims (16)

1. A method for multi-dimensional chromatography of a polyolefin polymer, comprising introducing a solution of the polyolefin polymer into a liquid flowing through a first liquid chromatography stationary phase or a field flow fractionation device and subsequently flowing the solution through a second liquid chromatography stationary phase, the second liquid chromatography stationary phase comprising graphitic carbon, the polyolefin polymer emerging from the liquid chromatography stationary phase with a retention factor greater than zero.

2. The method of claim 1 , wherein the solution introduced into the first or second, or both, liquid chromatography stationary phase(s) is subjected to a temperature gradient.

3. The method of claim 1 , wherein the solution introduced into the first or second, or both, liquid chromatography stationary phase(s) is subjected to a solvent gradient.

4. The method of claim 1 , wherein the solution introduced into the first or second, or both, liquid chromatography stationary phase(s) is subjected to both a temperature gradient and a solvent gradient.

5. The method of claim 1 , where the polyolefin polymer is a copolymer consisting essentially of ethylene and an alpha-olefin.

6. The method of claim 5 , where the alpha-olefin consists essentially of 1-octene.

7. The method of claim 1 , where the polyolefin polymer is a copolymer consisting essentially of propylene and an alpha-olefin.

8. The method of claim 7 , where the alpha-olefin consists essentially of ethylene.

9. The method of claim 1 , where the polyolefin polymer has a concentration in the solution of polyolefin polymer of greater than 0.1 milligrams per milliliter of solution.

10. The method of claim 1 , where the second liquid chromatography stationary phase consists essentially of graphitic carbon.

11. The method of claim 1 , where the first liquid chromatography stationary phase consists essentially of a GPC column.

12. The method of claim 1 , where the second liquid chromatography stationary phase consists essentially of a GPC column.

13. The method of claim 12 wherein the first liquid chromatography stationary phase consists essentially of graphitic carbon.

14. A method for one-dimensional chromatography of a polyolefin polymer, comprising 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, the polyolefin polymer emerging from the liquid chromatography stationary phase with a retention factor greater than zero, and

wherein the solution introduced into the liquid chromatography stationary phase is subjected to a temperature gradient.

15. The method of claim 14 , wherein the solution introduced into the liquid chromatography stationary phase is subjected to a solvent gradient.