Shares of some top U.S. chemicals companies up at end of trading, Dec. 20; Dow Chemical shares jump 4.7% from previous day's close to US$26.96/share, DuPont increased 4.1% to settle at US$45.01/share

NEW YORK , December 20, 2011 () – Shares of some top chemicals companies were up at the close of trading:

Dow Chemical rose $1.22 or 4.7 percent, to $26.96.

DuPont rose $1.77 or 4.1 percent, to $45.01.

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