Polybutadienediol purification
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United States of America Patent
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May 26, 1981
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N/A
app pub date -
Nov 13, 1979
filing date -
Nov 13, 1979
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Expired
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Abstract
Butadiene is polymerized using hydrogen peroxide as a catalyst to provide polybutadiene (partaking of the nature of a polymethylenediol) suitable for use in making polyurethanes by reaction with diisocyanate compounds. Minor amounts of vinyl cyclohexene and related odiferous impurities are contaminants in such polybutadiene. Such contaminants are predominantly removed by selective volatilization during one or more treatments in a hot vacuum zone, the feedstock to the hot vacuum zone containing from about 0.4 to about 6% of a C.sub.9 --C.sub.13 saturated hydrocarbon entraining agent.
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