DuPont announced positive second quarter results this week, though the higher cost for raw materials adversely affected earnings from nylon volumes.Second quarter underlying earnings per share of $.90 were up 15 per cent as compared with 1999. Underlying after-tax operating income (ATOI) of $1,169m was up 16 per cent despite a $170m after-tax cost increase for raw materials. Sales of $7.9 billion increased 13 percent versus 1999 and were up in all segments. Strong ATOI growth came from the Performance Coatings & Polymers, Specialty Polymers, and Pigments & Chemicals segments, and from increased ownership in Pioneer Hi-Bred International.Worldwide segment sales volume grew 6 per cent, reflecting growth in all regions.Average selling prices (ex-currency) were up 2 per cent, the first significant year-over-year increase since the first quarter of 1998.