Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2006-03-07
2006-03-07
Keys, Rosalynd (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S619000, C252S187270, C252S187310
Reexamination Certificate
active
07009082
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.
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Do Hiep Quang
Sunkara Hari Babu
E.I. du Pont de Nemours and Company
Keys Rosalynd
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