BINDER SYSTEM BASED ON POLYURETHANE FOR PRODUCING CORES AND CASTING MOLDS USING CYCLIC FORMALDEHYDES, MOLDING MATERIAL MIXTURE, AND METHOD

摘要

The invention relates to a binder system for producing cores and casting molds based on polyurethane using phenolic resins, polyisocyanates, and cyclic formaldehydes. The invention further relates to a method for producing a casting and to molding material mixtures containing the binder.