Patent ID: 11905362
Assignee: ORIGIN MATERIALS OPERATING, INC.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 14:
15. A method of preparing a polymer composition having reduced color content, comprising:
a) polymerizing one of a substituted or unsubstituted furan-2,5-dicarboxylic acid dialkyl ester, and a substituted or unsubstituted tetrahydrofuran-2,5-dicarboxylic acid dialkyl ester in the presence of an organocatalyst and an antioxidant at a temperature of less than 250° C.; and
b) annealing the polymer composition, followed by performing solid state polymerization to provide a polymer composition having reduced color content,
wherein the polymer composition comprises one of the substituted or unsubstituted furandicarboxylate moiety and the substituted or unsubstituted tetrahydrofurandicarbwrylate moiety, and
an organocatalyst comprising carbene, or a fragment of the organocatalyst thereof,
wherein the polymer composition is free from metal catalysts or metal catalyst fragments, wherein the metal catalysts are at least one of a transesterification catalyst, a polycondensation catalyst, or polymerization catalysts used to produce the polymer or precursors thereof, and
wherein a solution of 5 mg/mL of the polymer composition in (i) hexafluoroisopropanol or (ii) hexafluoroisopropanol/dichloromethane has an absorbance of less than 0.5 at 400 nm; and
wherein the polymer composition having reduced color content has a number average molecular weight of at least 10,000 Da.