Non-veining urethane resins for foundry sand casting
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United States of America Patent
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Jan 7, 2014
Grant Date -
Sep 15, 2011
app pub date -
May 23, 2011
filing date -
Oct 6, 2009
priority date (Note) -
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Abstract
Described herein a method of manufacturing a metal shape that includes contacting a liquid metal and a surface of a foundry core under conditions wherein vein defects occur, the surface of the foundry core comprising a foundry aggregate, a combustible-organic material and a polyurethane resin, and the surface of the foundry core being free of or essentially free of an anti-veining agent; cooling the liquid metal to a temperature below its melting point thereby forming a metal shape; and then removing the foundry core from the metal shape.
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