The loss made by German maker of high-tech polymer materials Covestro AG widened in the first quarter compared to the same period of last year. Covestro reported that its first quarter net loss widened to €35 million ($37.5 million) from €26 million in the prior year. The group’s earnings before interest, taxes, depreciation and amortization (EBITDA) fell by 4.5% year-over-year to €273 million. This was primarily a result of lower margins, although the impact was somewhat mitigated by reductions in raw material and energy costs, partially offsetting the decline in selling price level. Group sa…