Binder composition useful for making Molded Articles for use in casting Metal Casting lightweight, whose articles then Rush to melt the metals of Light WeightWhere the core is endudecido gaseous Catalysis, Process for Forming cast goods according to the Melt Composition and Procedure for Such Articles

摘要

Binder compsn. for prepairing shaped foundry materials for casting light metals comprises a mixt. of aromatic-amine polyol (I) a liquid polyisocyanate and, as hardener, a normal gaseous tert. amine. (I) is pref. the reaction prod. of an aromatic amine (esp. amiline or its additions prod. with HCHO) with an alkylene oxide (esp. ethylene or propylene oxide. In conjunction with a particulate filler, the binder compsn. is used for preparing foundry cores and moulds. The compsn. cures at room temp. to give a non-friable material with good mechanical strength but which can be destroyed and removed by shaking from the metal casting after having been subjected to low casting temp.