CHICAGO — Fitch Ratings on Sept. 16 affirmed the long-term issuer ratings and senior unsecured debt of Sara Lee Corp. at BBB, and maintained the company’s outlook at stable. “Sara Lee’s credit ratings reflect the diversification and operating earnings improvement of its remaining product portfolio, primarily consisting of coffee, meats and bakery,” Fitch said. “The ratings also are supported by Sara Lee’s substantial liquidity, which is important as it completes the divestitures of its Household and Body Care businesses.”