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US 9,868,816 B2Granted
Aliphatic polycarbonate quench method
AssigneeSaudi Aramco Technologies Company
InventorsScott D. Allen, Jeffrey R. Conuel, David E. Decker, Anna E. Cherian
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Abstract
The present disclosure is directed to, in part, an aliphatic polycarbonate polymerization reaction initiated by combining an epoxide with carbon dioxide in the presence of a catalytic transition metal-ligand complex to form a reaction mixture, and further quenching that polymerization reaction by contacting the reaction mixture with an acid containing a non-nucleophilic anion produces a crude polymer solution with improved stability and processability.
Claims37
A method comprising:
- initiating an aliphatic polycarbonate polymerization reaction by combining an epoxide with carbon dioxide in the presence of a catalytic transition metal-ligand complex to form a reaction mixture comprising a polycarbonate chain, wherein the catalytic transition metal-ligand complex comprises at least one ligand that is a polymerization initiator and at least one ligand that is not a polymerization initiator;
- and
- quenching the polymerization reaction by contacting the reaction mixture with an acid containing an anion that is not a polymerization initiator.
Dependencies are inferred from the claim text.