Methods for the purification of polymers

Details Methods for the purification of polymers Methods for the purification of polymers

2008-01-22

2010-06-29

Boykin, Terressa M (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

C526S329700, C528S361000, C528S421000

Reexamination Certificate

active

07745566

ABSTRACT:
The present invention provides methods for purifying polymers. In each embodiment of the invention disclosed herein, a supercritical fluid is contacted with an organic solution that includes a polymer to be purified dissolved in an organic solvent. The supercritical fluid extracts the organic solvent from the organic solution. Impurities such as residual monomers and process solvents are removed with the organic solvent and supercritical fluid, thereby purifying the polymer. The methods of the invention are particularly suitable for use in the purification of biodegradable polymers for use in pharmaceutical applications.

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Corresponding U.S. Appl. No. 12/017,414, filed Jan. 22, 2008, Entitled Supercritical Fluid Extraction Produced by In-Line Homogenization, P. Chattopadhyay et al. (Not yet published).

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