Alkaline benzylic ether phenolic resin binders
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United States of America
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Apr 20, 1993
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app pub date -
Mar 2, 1992
filing date -
Mar 24, 1989
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Abstract
Modified benzylic ether resole resins and process for their preparation. The resins are prepared by treating a phenol with a molar excess of aldehyde in the presence of a divalent metal ion catalyst at a pH below 7 followed by further reaction at a pH above 8 in the presence of an alkaline catalyst. Alkaline solutions of the resins are used as foundry binders in an ester cure process.
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