Continuously variable transmission fluid and method of making same
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United States of America Patent
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Issued Date -
Dec 2, 2004
app pub date -
Sep 24, 2003
filing date -
Sep 30, 2002
priority date (Note) -
Abandoned
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Abstract
A continuously variable transmission fluid comprises a hydrogenated cyclic dimer of .alpha.-alkyl styrene and a low temperature viscosity control agent. The fluid does not contain more than 20 wt. % of a linear dimer of the .alpha.-alkyl styrene, and the fluid has a kinematic viscosity of greater than about 2.5.times.10.sup.-6 m.sup.2/s at 100.degree. C., as measured according to ASTM D-445. The dimerized .alpha.-alkyl styrene can be made by (a) contacting an .alpha.-alkyl styrene with a supported acid catalyst to effect oligomerization of the .alpha.-alkyl styrene to a cyclic dimer; and (b) hydrogenating the cyclic dimer in the presence of a hydrogenation catalyst to produce a fully hydrogenated cyclic dimer, wherein the .alpha.-alkyl styrene is contacted with the supported acid catalyst in the absence of a solvent for the .alpha.-alkyl styrene and a free acid.
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