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US 7,009,082 B2Granted
Removal of color bodies from polytrimethylene ether glycol polymers
AssigneeE.I. du Pont de Nemours and Company
InventorsHari Babu Sunkara, Hiep Quang Do
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Abstract
A process is described for reducing the discoloration of PO3G. The discolored polymer is contacted with adsorbent and separated therefrom, for instance, by filtration. The treated polytrimethylene, preferably, has an APHA color of less than about 50 and a molecular weight of about 250 to about 5000.
Claims6
A product comprising:
- (i) PO3G having color and (ii) activated carbon, wherein the PO3G has a APHA color of less then about 50.
Dependencies are inferred from the claim text.