Granted Patent
B2
US 12,258,427 · App. 17/415,609 · Granted Mar 25, 2025
Processes for increasing the molecular weight of guayule natural rubber
Assignee:
Bridgestone Corporation
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Abstract
Disclosed herein are process for increasing the molecular weight of guayule natural rubber that is solubilized in an organic solvent solution. The processes utilize shear desolventizing to achieve the increase in molecular weight.
Claims (29)
1. A process for increasing the molecular weight of solubilized guayule natural rubber comprising
a. providing an organic solvent-guayule natural rubber solution comprising (i) guayule natural rubber having an initial Mw in grams/mole, and (ii) optionally guayule resin, wherein the organic solvent-guayule natural rubber solution of (a) includes about 5 to about 40 weight % guayule natural rubber, based upon the total weight of the organic solvent-guayule natural rubber solution; and
b. subjecting the organic solvent-guayule natural rubber solution of (a) to shear desolventizing under conditions including at least one of (i) a temperature of about 160 to about 280° F., or (ii) a pressure of about 29 inches Hg absolute to about 0.1 inches Hg absolute or about 100 kPa absolute to about 0.3 kPa absolute,
thereby producing a desolventized guayule natural rubber having 1 weight % or less organic solvent, and an Mw in grams/mole that is at least 10% higher than the initial Mw.
2. The process of claim 1 , wherein the shear desolventizing uses a twin screw extruder.
3. A process for increasing the molecular weight of solubilized guayule natural rubber comprising:
a. providing an organic solvent-guayule natural rubber solution comprising (i) guayule natural rubber having an initial Mw in grams/mole, and (ii) optionally guayule resin, wherein the organic solvent-guayule natural rubber solution of (a) includes about 5 to about 40 weight % guayule natural rubber, based upon the total weight of the organic solvent-guayule natural rubber solution; and
b. subjecting the organic solvent-guayule natural rubber solution of (a) to shear desolventizing under conditions including at least one of (i) a temperature of about 160 to about 280° F., or (ii) a pressure of about 29 inches Hg absolute to about 0.1 inches Hg absolute or about 100 kPa absolute to about 0.3 kPa absolute,
thereby producing a desolventized guayule natural rubber having 1 weight % or less organic solvent, and an Mw in grams/mole that is at least 50,000 grams/mole higher than the initial Mw of the guayule natural rubber of (a).
4. The process of claim 1 , wherein the desolventized guayule natural rubber has an Mw in grams/mole that is 10-50% higher than the initial Mw.
5. The process of claim 1 , wherein the initial Mw of the guayule natural rubber of (a) is about 0.4 million to about 1.6 million grams/mole.
6. The process of claim 1 , wherein the initial Mw of the guayule natural rubber of (a) is about 0.4 million to about 1 million grams/mole.
7. The process of claim 5 , wherein the initial Mw of the guayule natural rubber of (a) is about 1 million to about 1.6 million grams/mole.
8. The process of claim 5 , wherein the Mw of the desolventized natural rubber is about 0.6 million to about 1.3 million grams/mole.
9. The process of claim 4 , wherein the Mw of the desolventized natural rubber is about 1.1 million to about 1.9 million grams/mole.
10. The process claim 1 , wherein the organic solvent-guayule natural rubber solution of (a) includes no more than 7 weight % of guayule resin, based upon the total weight of the organic solvent-guayule natural rubber solution.
11. The process of claim 1 , wherein the organic solvent-guayule natural rubber solution of (a) includes about 20 to about 40 weight % guayule natural rubber, based upon the total weight of the organic solvent-guayule natural rubber solution.
12. The process of claim 1 , wherein the organic solvent-guayule natural rubber solution of (a) includes about 35 to about 55 weight % non-polar organic solvent, based upon the total weight of the organic solvent-guayule natural rubber solution.
13. The process of claim 12 , wherein the non-polar organic solvent is selected from the group consisting of alkanes having from 4 to 9 carbon atoms; cycloalkanes and alkyl cycloalkanes having from 5 to 10 carbon atoms; aromatics and alkyl substituted aromatics having from 6 to 12 carbon atoms; and combinations thereof.
14. The process of claim 1 , wherein the organic solvent solution of (a) includes (i) about 40 to about 65 weight % polar organic solvent, based upon the total weight of the organic solvent solution.
15. The process of claim 14 , wherein the polar organic solvent is selected from the group consisting of alcohols having 1 to 8 carbon atoms; ethers and esters having from 2 to 8 carbon atoms; cyclic ethers having from 4 to 8 carbon atoms; and ketones having from 3 to 8 carbon atoms; and combinations thereof.
16. The process of claim 1 , wherein the organic solvent-guayule natural rubber solution comprises 35-55 weight % of one or more alkanes having 6 carbon atoms and 40-65 weight % of acetone.
17. The process of claim 1 , wherein the shear desolventizing includes addition of water in a weight amount of 0.05:1 to 0.5:1, based upon the amount of guayule rubber present in the organic solvent-guayule natural rubber solution of (a).
18. The process of claim 17 , wherein the water meets at least one of the following:
a. has a total dissolved solids content of no more than 300 ppm; or
b. is at a temperature of about 75 to about 110° F. before addition.
19. The process of claim 1 , wherein the temperature (i) during shear desolventizing is about 200 to about 230° F.
20. The process of claim 17 , wherein the shear desolventizing includes use of a twin screw extruder having a length and at least 3 injection ports spaced along the length, and the water is added via an injection port.
21. The process of claim 1 , wherein the shear desolventizing includes use of a twin screw extruder having at least one injection port.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Jun 18, 2021
From: WHITE, ROBERT W.; HARTZELL, MICHAEL R.
To: BRIDGESTONE CORPORATION
Reel/Frame 056583/0275 →
Continuity (2)
Provisional Application
62783232
· Dec 21, 2018
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