Goldman Sachs analyst Robert Koort has downgraded his evaluation of the U.S. chemical sector from "attractive" to "neutral," sending the stocks of chemical makers including Eastman and PPG Industries lower last week after the announcement. Even though the companies have bounced back during the past 12 months, and in spite of strong second-quarter expectations, there remains "increased uncertainty" about their performance for the rest of 2010 through early 2011, according to Koort.

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