Phenol-formaldehyde novolac resin having low concentration of free phenol
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United States of America Patent
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Oct 4, 2016
Grant Date -
Sep 25, 2014
app pub date -
Jun 4, 2014
filing date -
May 11, 2007
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Abstract
A phenol-formaldehyde novolac resin having a low concentration of free phenol prepared by distilling residual phenol from a molten novolac resin and replacing at least a portion of the phenol with a solvent having a volatility equal to or less than phenol. Such modified novolac resins are suitable for the production of resin coated molding sands for shell molding and sand cores, as well as for the production of resin coated proppants for use in oil and gas recovery operations.
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