NEW YORK (Standard&Poor's) Feb. 12, 2009--Standard&Poor's Ratings Services said today that it affirmed its ratings including its 'A' long-term and 'A-1' short-term corporate credit ratings on E.I. DuPont de Nemours&Co. However, we revised the outlook to negative from stable. "We are concerned that demand weakness stemming from poor global economic conditions could cause operating performance to fall short of our expectations despite aggressive steps management is taking to cut costs and decrease net working capital," said Standard&Poor's credit analyst Cynthia Werneth. In addition, we believe there is a risk that unfunded postretirement liabilities, which we expect to have risen sharply as of year-end 2008, could experience further material increases, or that related