Low free formaldehyde phenolic polyol formulation
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United States of America Patent
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Nov 23, 1993
Issued Date -
N/A
app pub date -
Nov 16, 1992
filing date -
Jun 12, 1991
priority date (Note) -
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Abstract
A resin is prepared by the reaction of a phenol, an aldehyde and an aliphatic hydroxy compound containing two or more hydroxy groups per molecule in the presence of a divalent metal ion catalyst. These resins react with polyisocyanates to form polyurethanes that are useful binders for foundry cores and molds.
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