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Credit rating service Standard & Poor's raised Sigma-Aldrich Corp.'s outlook Friday, saying the company's specialty chemical business has performed well despite the economic downturn.

Standard & Poor's said the company's outlook appears "Positive," an upgrade from "Stable." The credit rating service affirmed a "A'' corporate credit rating for the biochemicals company.

Sigma-Aldrich is expected to maintain its recent operating performance while making "prudent" acquisition decisions, according to a note from Standard & Poor's.

Shares of Sigma-Aldrich Corp. fell 21 cents to $53.75 in midday trading.

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