Polyurethane based binder system for the manufacture of foundry cores and molds
AssigneeAshland-Sudchemie-Kernfest GmbH
InventorsJean-Claude Roze, Gunther Weicker, Diether Koch, Andreas Werner
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Abstract
This invention relates to a binder system comprising a phenolic resin component and an isocyanate component where the phenolic resin component comprises an alkoxy-modified phenolic resole resin such that less than 25 mole percent of the phenolic hydroxyl groups of the phenolic resole resin are etherified by a primary or secondary aliphatic monoalcohol.
Claims15
A binder system comprising a phenolic resole resin component and an isocyanate component, wherein the phenolic resin component comprises (a) an alkoxy-modified phenolic resole resin and (b) an oxygen-rich polar, organic solvent.
The binder system of claim 2 wherein the oxygen-rich polar, organic solvent is selected from the group consisting of glycol ether esters, glycol diesters, glycol diethers, cyclic ketones, cyclic esters, cyclic carbonate, and mixtures thereof.
Dependencies are inferred from the claim text.