Process for hydrotreating resins to lighten color
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United States of America Patent
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Oct 6, 1998
Grant Date -
N/A
app pub date -
Feb 1, 1996
filing date -
Feb 3, 1995
priority date (Note) -
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Abstract
The color of hydrocarbon resins having carbon-carbon double bonds and containing color bodies is lightened by a hydrotreating process consisting essentially of contacting the resin with hydrogen at a hydrogen pressure of 1 to about 20 bar (14.5 to about 290 psi) in the presence of a catalyst that promotes the hydrogenation of the color bodies without substantially changing the softening point or the content of carbon-carbon double bonds in the resin. The preferred catalyst is nickel/zinc oxide on SiO.sub.2.
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