Evonik has acquired a minority stake in Chinese company UnionTech through its Venture Capital unit.    The Shanghai-based company is active in the field of stereolithography 3D printing.    This additive manufacturing technology makes it possible, to produce highly accurate and detailed polymer parts.    “We expect great technical advances in the field of stereolithography. Evonik is preparing the launch of ready-to-use materials for this process,” said Bernhard Mohr, hea...