Phenol-formaldehyde resins modified with guanidine salts
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United States of America Patent
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Jun 9, 1998
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N/A
app pub date -
Jan 21, 1997
filing date -
Jan 21, 1997
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Expired
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Abstract
A guanidine-modified phenol-formaldehyde resole resin by reacting formaldehyde and phenol at a formaldehyde to phenol mole ratio above about 1.5:1 in the presence of an effective amount of an alkaline catalyst and in the presence of a catalytic amount of a guanidine salt. The resin is suitable for use in adhesives for high moisture content substrates.
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