German manufacturer of high-tech polymer materials Covestro AG slipped into the red in the second quarter of the year. Covestro reported on Tuesday that its second-quarter net loss was €72 million (($77.9 million), compared to the previous year’s net income of €46 million. Earnings before interest, taxes, depreciation and amortization (EBITDA) at group level fell 16.9% to €320 million from the previous year’s €385 million. The company noted that lower raw material prices only partially offset the demand-related decline in average sales prices. Group sales remained stable at €3.7 billion due to…