Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2007-08-03
2010-06-29
Keys, Rosalynd (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S619000
Reexamination Certificate
active
07745668
ABSTRACT:
Processes for reducing color in PO3G are provided. The processes include contacting PO3G with an activated carbon and then separating the PO3G from the activated carbon by, for example, filtration. The process provides PO3G having an APHA color less than that before contact with the absorbent. The processes are desirably used for polymers having a molecular weight of about 250 to about 5000.
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Do Hiep Quang
Sunkara Hari Babu
E. I. du Pont de Nemours and Company
Keys Rosalynd
Tanzer Gail D.
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