Low noack volatility poly .alpha.-olefins
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United States of America Patent
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Nov 30, 2004
Grant Date -
Dec 19, 2002
app pub date -
May 17, 2001
filing date -
May 17, 2001
priority date (Note) -
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Abstract
The present invention relates to poly .alpha.-olefins (PAO's) which exhibit superior Noack volatility at low pour points. Mixtures of 1-decene and 1-dodecene are polymerized using an alcohol promoted BF.sub.3 in conjunction with a combination of cocatalysts. The reaction mixture is distilled to remove the unreacted monomeric and dimeric species. The resulting product is then hydrogenated to saturate the oliogomers to provide a hydrogenated product which has a viscosity of 5 cSt. This product is distilled to provide PAO's of varying viscosity grades. The 4 cSt PAO is comprised mostly of trimers and tetramers while the 6 cSt product is comprised of trimers, tetramers, and pentamers.
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