Novolaks of the phenol-dense aldehyde type
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United States of America Patent
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May 2, 1995
Grant Date -
N/A
app pub date -
Sep 14, 1990
filing date -
Jan 25, 1989
priority date (Note) -
Expired
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Abstract
New formaldehyde-phenol resins of the novolak type comprising aliphatic aldehyde radicals with 6 or more carbon atoms and with the molar ratio between these heavy aldehyde radicals and the phenolic structures being between 0.9 and 1.2. They are obtained by the condensation of phenols with aldehyde compounds containing at least 543% heavy aldehydes in the presence of acid catalysts in a virtually anhydrous medium. Application to the reinforcement of vulcanized rubbers.
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