End-group isomerization of poly(alkylene carbonate) polymers
AssigneeSaudi Aramco Technologies Company
InventorsJames Eagan, Christopher A. Simoneau, Jay J. Farmer
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Abstract
Described herein are methods of preparing poly(alkylene carbonate) polymers comprising an increased ratio of primary hydroxyl end groups to secondary hydroxyl end groups, and compositions thereof.
Claims29
1-13. (canceled)
A poly(propylene carbonate) (“PPC”) polymer composition comprising a plurality of poly(propylene carbonate) polymer chains, where the poly(propylene carbonate) chains contain isopropylene moieties separating each carbonate linkage, characterized in that a percentage of intrapolymer adjacent isopropylene moieties are arranged in a head-to-tail enchainment, and a percentage of secondary OH end groups is less than a percentage of intrapolymer carbonate units arranged in a head-to-tail enchainment.
15-22. (canceled)
A method for increasing the ratio of primary to secondary OH end groups of a poly(propylene carbonate) (“PPC”) polymer composition, the method comprising the step of contacting a starting PPC polymer composition with an isomerization catalyst to provide a modified PPC polymer composition wherein the modified PPC polymer composition has a higher ratio of primary to secondary OH end groups than the starting PPC polymer composition.
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31-32. (canceled)
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46-47. (canceled)
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Dependencies are inferred from the claim text.