Modified phenolic resin from formaldehyde polymer, phenol and oil or pitch
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United States of America Patent
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-
Jul 11, 1995
Grant Date -
N/A
app pub date -
Feb 3, 1994
filing date -
Feb 5, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for producing a modified phenolic resin comprises heating (a) petroleum heavy oil or pitch and (b) a formaldehyde polymer in a molar ratio of formaldehyde:oil or pitch of from 1 to 15:1 in the presence of an acid catalyst, adding phenol in a molar ratio of phenol:oil or pitch of from 0.5 to 5:1 to form a crude modified phenolic resin, and purifying by performing in optional sequence (i) a treatment with an aliphatic or alicyclic hydrocarbon to remove unreacted components and (ii) an extraction with a solvent wherein the catalyst has a solubility of 0.1 or less to remove the catalyst.
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