Binders containing an epoxy resin, an ester of a fatty acid, and a fluorinated acid
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United States of America Patent
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Oct 31, 2006
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app pub date -
Jul 25, 2003
filing date -
Jul 25, 2003
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Abstract
This invention relates to foundry binder systems, which cure in the presence of sulfur dioxide and an oxidizing agent, comprising (a) an epoxy resin; (b) an ester of a fatty acid; (c) a fluorinated acid, preferably hydrofluoric acid; (d) an effective amount of a oxidizing agent; and (e) no ethylenically unsaturated monomer or polymer. The foundry binder systems are used for making foundry mixes. The foundry mixes are used to make foundry shapes (such as cores and molds) which are used to make metal castings, particularly ferrous castings.
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