Ratings firm Standard & Poor's has upgraded its outlook on U.S. major Dow Chemical from "stable" to "positive" after the company made strides in its second-quarter performance. Meanwhile, S&P maintained its investment-grade rating on Dow and its Rohm and Haas and Union Carbide units. Dow's ability to bolster its finances "supports our view that Dow has the capacity to achieve further meaningful improvement to credit metrics," an S&P analyst said in a statement.

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