BINDER SYSTEM BASED ON POLYURETHANE FOR PRODUCING CORES AND CASTING MOLDS USING CYCLIC FORMALS, MOLDING MATERIAL MIXTURE, AND METHOD
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United States of America Patent
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Issued Date -
Oct 9, 2014
app pub date -
Jul 28, 2011
filing date -
Jul 30, 2010
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Abandoned
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Abstract
A binder system for a molding mixture has at least one phenolic resin component, at least one isocyanate component and at least one solvent component, where the at least one solvent component is a cyclic formal, also known as a cyclic formaldehyde, with or without additional solvents. The phenolic resin component is prepared by reacting a phenol compound with an aldehyde compound. The isocyanate component has at least polyisocyanate that has at least two isocyanate groups per molecule. In the molding mixture, the binder is combined with a refractory molding material.
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