Amine modified polyisocyanates and their use in foundry binder systems
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United States of America Patent
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Mar 9, 1999
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N/A
app pub date -
Nov 7, 1996
filing date -
Nov 7, 1996
priority date (Note) -
Expired
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Abstract
The invention relates to amine modified polyisocyanates having urea linkages and their use in foundry binder systems. The modified polyisocyanates are prepared by reacting a polyisocyanate with an aliphatic primary or secondary amine. These amine modified polyisocyanates, along with a phenolic resole resin, are added to a foundry aggregate to form a foundry mix which is shaped and cured with an amine curing catalyst.
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